Make FindFFMPEG understand that pc files can have no Libs.private sec…

…tion

.github/workflows/windows.yml

@@ -100,6 +100,10 @@ jobs:
           path: |
             C:/src/**/*.log
 
+      - name: Fix openh264 linking
+        run: |
+          sed -i 's/ openh264\.lib //g' /c/builddir/build.ninja
+
       - name: 🌋 Build
         run: |
           cmake --build "${{ env.CMAKE_BUILD_DIR }}" --config ${{ env.BUILD_TYPE }}

vcpkg/ports/qtmultimedia/portfile.cmake

@@ -5,6 +5,7 @@ set(${PORT}_PATCHES
     static_find_modules.patch
     fix_avfoundation_target.patch
     remove-static-ssl-stub.patch
+    private_libs.patch
 )
 
 vcpkg_check_features(OUT_FEATURE_OPTIONS FEATURE_OPTIONS

vcpkg/ports/qtmultimedia/private_libs.patch

@@ -0,0 +1,19 @@
+diff --git a/cmake/FindFFmpeg.cmake b/cmake/FindFFmpeg.cmake
+index 6316dde..54f807b 100644
+--- a/cmake/FindFFmpeg.cmake
++++ b/cmake/FindFFmpeg.cmake
+@@ -264,9 +264,11 @@ function(__ffmpeg_internal_set_dependencies _component)
+     string(REGEX MATCHALL "${prefix_l}[^ ]+" libs_dependency ${out})
+     string(REGEX MATCHALL "[^ ]+${suffix_lib}" libs_dependency_lib ${out})
+
+-    string(REGEX REPLACE ".*Libs.private:([^\n\r]+).*" "\\1" out "${pcfile}")
+-    string(REGEX MATCHALL "${prefix_l}[^ ]+" libs_private_dependency ${out})
+-    string(REGEX MATCHALL "[^ ]+${suffix_lib}" libs_private_dependency_lib ${out})
++    if(out MATCHES "Libs.private:")
++      string(REGEX REPLACE ".*Libs.private:([^\n\r]+).*" "\\1" out "${pcfile}")
++      string(REGEX MATCHALL "${prefix_l}[^ ]+" libs_private_dependency ${out})
++      string(REGEX MATCHALL "[^ ]+${suffix_lib}" libs_private_dependency_lib ${out})
++    endif()
+
+     list(APPEND deps_no_suffix ${libs_dependency} ${libs_private_dependency})
+     foreach(dependency ${deps_no_suffix})