[libpng] Replace find_library() with a simple set() for linking libm on UNIX #8079
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Similar issue as with Pull Request #7989, but different and more generic fix. Linking libm will work with the default x64-linux triplet, but fail if cross compiling (with a user-specific x86-linux triplet for example), with or without emscripten. As libm is part of the standard library, it can just be linked with its name.
This issue was also present in the Conan package manager and fixed the same way.