gdal-3.6.3-c++17.patch

diff -up gdal-3.6.3/CMakeLists.txt.omv~ gdal-3.6.3/CMakeLists.txt
--- gdal-3.6.3/CMakeLists.txt.omv~	2023-03-14 14:39:13.818131103 +0100
+++ gdal-3.6.3/CMakeLists.txt	2023-03-14 14:39:21.620178966 +0100
@@ -38,7 +38,7 @@ define_property(
 #
 # check compiler and set preferences.
 if (NOT CMAKE_CXX_STANDARD)
-    set(CMAKE_CXX_STANDARD 11)
+    set(CMAKE_CXX_STANDARD 20)
     set(CMAKE_CXX_STANDARD_REQUIRED ON)
 endif()