games/RetroArch: Patched from upstream + add optional dep.

Signed-off-by: David Spencer <idlemoor@slackbuilds.org>

games/RetroArch/README

@@ -26,7 +26,7 @@ If building debugging symbols asan can also be built:
 
 Optional dependencies:
   ffmpeg jack-audio-connection-kit libxkbcommon miniupnpc
-  nvidia-cg-toolkit python3 qt5 SDL2 vulkansdk wayland
+  nvidia-cg-toolkit OpenAL python3 qt5 SDL2 vulkansdk wayland
 
 Python3 support for shaders will need to be enabled with:
   PYTHON=1 ./RetroArch.SlackBuild

games/RetroArch/RetroArch.SlackBuild

@@ -24,7 +24,7 @@
 
 PRGNAM=RetroArch
 VERSION=${VERSION:-1.7.3}
-BUILD=${BUILD:-1}
+BUILD=${BUILD:-2}
 TAG=${TAG:-_SBo}
 
 if [ -z "$ARCH" ]; then
@@ -114,6 +114,11 @@ sed -e "s|# audio_filter_dir =|audio_filter_dir = /usr/lib${LIBDIRSUFFIX}/retroa
     -e "$SED_CORE;$SED_INFO;$SED_MENU" \
     -i retroarch.cfg
 
+# Qt: only check for pending events of the main thread
+# https://github.com/libretro/RetroArch/commit/c2ad8d47d382c7460bb54c8a7116573d95648f95
+# https://github.com/libretro/RetroArch/issues/6726
+zcat $CWD/qt.patch.gz | patch -p1
+
 # Set $lib to a portable array
 eval "set -- $lib"