cmake, ci: Build bundled FFmpeg with yuzu

Drops usage of CMAKE_DEPENDENT_OPTION to allow using
YUZU_USE_BUNDLED_FFMPEG as an option on any platform. CI then now builds
FFmpeg always, netting about 10 MB less used on the AppImage.

Also somewhat fixes YUZU_USE_BUNDLED_QT so that it can be used even if
CMake doesn't clean up its state after running the first find_package.

.ci/scripts/linux/docker.sh

@@ -18,7 +18,8 @@ cmake .. \
       -DENABLE_COMPATIBILITY_LIST_DOWNLOAD=ON \
       -DENABLE_QT_TRANSLATION=ON \
       -DUSE_DISCORD_PRESENCE=ON \
-      -DYUZU_ENABLE_COMPATIBILITY_REPORTING=${ENABLE_COMPATIBILITY_REPORTING:-"OFF"}
+      -DYUZU_ENABLE_COMPATIBILITY_REPORTING=${ENABLE_COMPATIBILITY_REPORTING:-"OFF"} \
+      -DYUZU_USE_BUNDLED_FFMPEG=ON
 
 make -j$(nproc)
 

CMakeLists.txt

@@ -25,7 +25,7 @@ option(YUZU_USE_BUNDLED_BOOST "Download bundled Boost" OFF)
 
 option(YUZU_USE_BUNDLED_LIBUSB "Compile bundled libusb" OFF)
 
-CMAKE_DEPENDENT_OPTION(YUZU_USE_BUNDLED_FFMPEG "Download/Build bundled FFmpeg" ON "WIN32" OFF)
+option(YUZU_USE_BUNDLED_FFMPEG "Download/Build bundled FFmpeg" "${WIN32}")
 
 option(YUZU_USE_QT_WEB_ENGINE "Use QtWebEngine for web applet implementation" OFF)
 
@@ -253,7 +253,9 @@ if(ENABLE_QT)
 
     # Check for system Qt on Linux, fallback to bundled Qt
     if (${CMAKE_SYSTEM_NAME} STREQUAL "Linux")
+        if (NOT YUZU_USE_BUNDLED_QT)
             find_package(Qt5 ${QT_VERSION} COMPONENTS Widgets)
+        endif()
         if (NOT Qt5_FOUND OR YUZU_USE_BUNDLED_QT)
             # Check for dependencies, then enable bundled Qt download