opencv 4.x: some contrib modules require eigen library

[db4]

library name and version: opencv/4.x

Combination of with_contrib=True and with_eigen=False makes find_package(OpenCV) fail with

-- Conan: Target declared 'opencv::opencv'
CMake Error at build/generators/cmakedeps_macros.cmake:39 (message):
  Library 'opencv_alphamat453' not found in package.  If
  'opencv_alphamat453' is a system library, declare it with
  'cpp_info.system_libs' property

contrib_sfm also requires with_eigen, so I added a check to validate()

• I've read the guidelines for contributing.
• I've followed the PEP8 style guides for Python code in the recipes.
• I've used the latest Conan client version.
• I've tried at least one configuration locally with the conan-center hook activated.

[ghost]

I detected other pull requests that are modifying opencv/4.x recipe:

• opencv: conan v2 support + bump dependencies #13406
• opencv(4.x): disable quirc if dnn is disabled #13215
• opencv/4.6.0 version bump #13119
• opencv 4.x: fix ffmpeg check in test_package #11433

This message is automatically generated by https://github.com/ericLemanissier/conan-center-conflicting-prs so don't hesitate to report issues/improvements there.

[conan-center-bot]

Failure in build 4 (c0b3a80d56351ae654dbf98d5cfc6681c0d7ec0a):

• opencv/4.5.1@:
  Didn't run or was cancelled before finishing

• opencv/4.5.2@:
  Didn't run or was cancelled before finishing

• opencv/4.5.5@:
  Didn't run or was cancelled before finishing

• opencv/4.5.0@:
  CI failed to create some packages (All logs)

  Logs for packageID 963d081a642835314dc9ae83664814e6365817bb:

  [settings]
  arch=x86_64
  build_type=Debug
  compiler=gcc
  compiler.libcxx=libstdc++11
  compiler.version=5
  os=Linux
  [options]
  opencv:shared=False
  

  [...]
      libpng/1.6.37:46c454909ce04fcfe4d444e9e216b9d9fbf98ebb - Download
      libsndfile/1.0.31:1021cae4be0a02f327b98150318613744064cfd0 - Download
      libtiff/4.3.0:6cbd95515c1d554969c6398e82b0bbc6d2e57799 - Missing
      libtool/2.4.7:696f7b257d23cc737d9fa236a53b1eeefd82f76e - Download
      libvpx/1.11.0:d1ccaf3d46c0ff4765ae567ea8252bc84c2e5c0a - Download
      libwebp/1.2.2:44ff56a61aee602b7d6ec9df4c3f7de18222f285 - Download
      libx264/20191217:f4bb5f8aaf6a1d2012ac913e41730dc0d2a56a4e - Download
      libx265/3.4:59e60c28d769a973dd958f0d1e294bb1770c175c - Download
      libxml2/2.9.14:93b75e5cab3a123bee04f92640085d7cefb16f7a - Download
      m4/1.4.19:cc9f9b2b9f92fc82888026414560bf79d8c3a052 - Download
      ogg/1.3.5:b1b85bfdc2206d81b3ed6a49e78498182bb98ef3 - Download
      opencv/4.5.0:963d081a642835314dc9ae83664814e6365817bb - Build
      openexr/2.5.7:de41549e84256614563dba7b41e7821e797babf8 - Download
      openh264/2.1.1:fcc9bda6948b7e5cd4eddd99173a9b73f3bfaebb - Download
      openjpeg/2.5.0:b1b85bfdc2206d81b3ed6a49e78498182bb98ef3 - Download
      openssl/1.1.1q:b1b85bfdc2206d81b3ed6a49e78498182bb98ef3 - Download
      opus/1.3.1:b1b85bfdc2206d81b3ed6a49e78498182bb98ef3 - Download
      protobuf/3.17.1:8bf36f45b7ab8d0522f88f42383e3f3a936b5951 - Download
      pulseaudio/14.2:3763be08eb04e3078d1fd6529c3b8577b2c6378a - Download
      quirc/1.1:8a622357d8c87d5bd4e17262afddb8be1ec8127f - Download
      vaapi/system:5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9 - Download
      vdpau/system:5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9 - Download
      vorbis/1.3.7:519c95d02e3c7ce25bd78a5f8ba64df1804003e4 - Download
      vulkan-headers/1.3.221:5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9 - Download
      vulkan-loader/1.3.221:1d407e7585802999f18a2cc5f2e94337e9e5653c - Download
      wayland/1.21.0:7ac14aa71ba24082b43cd2ba266300e06d1eef9d - Download
      xorg/system:5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9 - Download
      xz_utils/5.2.5:b1b85bfdc2206d81b3ed6a49e78498182bb98ef3 - Download
      zlib/1.2.12:b1b85bfdc2206d81b3ed6a49e78498182bb98ef3 - Download
      zstd/1.5.2:53f5ccb6f18d17f6712ca526ae5f55b55a7a9676 - Download
  
  Installing (downloading, building) binaries...
  
  WARN: libtiff/4.3.0: requirement libjpeg/9e overridden by opencv/4.5.0 to libjpeg/9d 
  WARN: libtiff/4.3.0: requirement libwebp/1.2.4 overridden by opencv/4.5.0 to libwebp/1.2.2 
  WARN: ffmpeg/4.4: requirement libwebp/1.2.3 overridden by opencv/4.5.0 to libwebp/1.2.2 
  WARN: freetype/2.12.1: requirement libpng/1.6.38 overridden by ffmpeg/4.4 to libpng/1.6.37 
  ERROR: Missing binary: libtiff/4.3.0:6cbd95515c1d554969c6398e82b0bbc6d2e57799
  libtiff/4.3.0: WARN: Can't find a 'libtiff/4.3.0' package for the specified settings, options and dependencies:
  - Settings: arch=x86_64, build_type=Debug, compiler=gcc, compiler.libcxx=libstdc++11, compiler.version=5, os=Linux
  - Options: cxx=True, fPIC=True, jbig=True, jpeg=libjpeg, libdeflate=True, lzma=True, shared=False, webp=True, zlib=True, zstd=True, jbig:build_executables=True, jbig:fPIC=True, jbig:shared=False, libdeflate:fPIC=True, libdeflate:shared=False, libjpeg:fPIC=True, libjpeg:shared=False, libwebp:fPIC=True, libwebp:near_lossless=True, libwebp:shared=False, libwebp:swap_16bit_csp=False, libwebp:with_simd=True, xz_utils:fPIC=True, xz_utils:shared=False, zlib:fPIC=True, zlib:shared=False, zstd:fPIC=True, zstd:shared=False, zstd:threading=True
  - Dependencies: zlib/1.2.12, libdeflate/1.12, xz_utils/5.2.5, libjpeg/9d, jbig/20160605, zstd/1.5.2, libwebp/1.2.2
  - Requirements: jbig/20160605.Y.Z, libdeflate/1.Y.Z, libjpeg/9d, libwebp/1.Y.Z, xz_utils/5.Y.Z, zlib/1.Y.Z, zstd/1.Y.Z
  - Package ID: 6cbd95515c1d554969c6398e82b0bbc6d2e57799
  
  ERROR: Missing prebuilt package for 'libtiff/4.3.0'
  Use 'conan search libtiff/4.3.0 --table=table.html -r=remote' and open the table.html file to see available packages
  Or try to build locally from sources with '--build=libtiff'
  
  More Info at 'https://docs.conan.io/en/latest/faq/troubleshooting.html#error-missing-prebuilt-package'
  

• opencv/4.1.2@:
  Didn't run or was cancelled before finishing

• opencv/4.5.3@:
  Didn't run or was cancelled before finishing

---

^{Note: To save resources, CI tries to finish as soon as an error is found. For this reason you might find that not all the references have been launched or not all the configurations for a given reference. Also, take into account that we cannot guarantee the order of execution as it depends on CI workload and workers availability.}

[stale]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This pull request has been automatically closed because it has not had recent activity. Thank you for your contributions.