Kai Pastor 7cd3196145
[libpng] Fix and cleanup (#24211)
* Fix unused CMake variable warning

* Acquire msys only on Windows

* Revise APNG variable names and usage

* Fix download mode usability with APNG

* Uncompress APNG patch with gzip

gzip is a default package of MSYS2 and (most) other systems.
7z download is implemented for windows only.

* Revise main CMake patches

cmake.patch deals with libpng build configuration.
fix-export-targets deals with cmake config export.

* Revise pkgconfig patching and fixup

* Additional cleanup

* Add usage based on FindPNG.cmake

* Update versions

Co-authored-by: Leonid Pospelov <pospelovlm@yandex.ru>
2022-04-18 14:33:43 -07:00

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The package libpng is compatible with built-in CMake targets:
find_package(PNG REQUIRED)
target_link_libraries(main PRIVATE PNG::PNG)