Fix postproc header detection (the test depends on inclusion of stdint.h but...

Fix postproc header detection (the test depends on inclusion of stdint.h but there is no right way to do that in cmake)

extras/buildsystem/cmake/include/config.cmake

@@ -467,7 +467,8 @@ if(FFmpeg_FOUND)
   vlc_check_include_files (ffmpeg/avcodec.h libavcodec/avcodec.h)
   vlc_check_include_files (ffmpeg/avutil.h libavutil/avutil.h)
   vlc_check_include_files (ffmpeg/swscale.h libswscale/swscale.h)
-  vlc_check_include_files (postproc/postprocess.h libpostproc/postprocess.h)
+  check_c_source_compiles( "#include <stdint.h>\n#include <postproc/postprocess.h>\nint main(){return 0;}" HAVE_POSTPROC_POSTPROCESS_H )
+  check_c_source_compiles( "#include <stdint.h>\n#include <libpostproc/postprocess.h>\nint main(){return 0;}" HAVE_LIBPOSTPROC_POSTPROCESS_H )
   
   message( STATUS "avcodec found ${HAVE_FFMPEG_AVCODEC_H} || ${HAVE_LIBAVCODEC_AVCODEC_H}")
   message( STATUS "avutil found ${HAVE_FFMPEG_AVUTIL_H} || ${HAVE_LIBAVUTIL_AVUTIL_H}")