cmake: Try to compensate for new ffmpeg directory structure by setting...

cmake: Try to compensate for new ffmpeg directory structure by setting HAVE_LIBSWSCALE_TREE if swscale.his found.

extras/buildsystem/cmake/include/config.cmake

@@ -454,7 +454,7 @@ if(FFmpeg_FOUND)
   vlc_check_include_files (ffmpeg/avcodec.h)
   vlc_check_include_files (ffmpeg/avutil.h)
   vlc_check_include_files (ffmpeg/swscale.h)
-  vlc_check_include_files (swscale.h)
+  check_include_files (swscale.h HAVE_LIBSWSCALE_TREE)
   
   check_include_files ("stdint.h;postproc/postprocess.h" HAVE_POSTPROC_POSTPROCESS_H)
   vlc_enable_modules(ffmpeg)