Qt: Fix Qt::5Multimedia build

src/platform/qt/AudioDevice.h

@@ -5,6 +5,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #ifndef QGBA_AUDIO_DEVICE
 #define QGBA_AUDIO_DEVICE
+
 #include <QAudioFormat>
 #include <QIODevice>
 

src/platform/qt/AudioProcessorQt.h

@@ -7,6 +7,8 @@
 #define QGBA_AUDIO_PROCESSOR_QT
 #include "AudioProcessor.h"
 
+ class QAudioOutput;
+
 namespace QGBA {
 
 class AudioDevice;

src/platform/qt/CMakeLists.txt

@@ -54,13 +54,14 @@ qt5_wrap_ui(UI_FILES
 	LogView.ui
 	VideoView.ui)
 
+set(QT_LIBRARIES)
 set(CPACK_DEBIAN_PACKAGE_DEPENDS "${CPACK_DEBIAN_PACKAGE_DEPENDS},libqt5widgets5,libqt5opengl5" PARENT_SCOPE)
 if(BUILD_SDL)
 	list(APPEND SOURCE_FILES AudioProcessorSDL.cpp)
 elseif(Qt5Multimedia_FOUND)
 	list(APPEND SOURCE_FILES
-	AudioProcessorQt.cpp
-	AudioDevice.cpp)
+		AudioProcessorQt.cpp
+		AudioDevice.cpp)
 	list(APPEND QT_LIBRARIES Qt5::Multimedia)
 	set(CPACK_DEBIAN_PACKAGE_DEPENDS "${CPACK_DEBIAN_PACKAGE_DEPENDS},libqt5multimedia5" PARENT_SCOPE)
 else()
@@ -85,7 +86,7 @@ endif()
 add_executable(${BINARY_NAME}-qt WIN32 MACOSX_BUNDLE main.cpp ${CMAKE_SOURCE_DIR}/res/mgba.icns ${SOURCE_FILES} ${PLATFORM_SRC} ${UI_FILES} ${RESOURCES})
 set_target_properties(${BINARY_NAME}-qt PROPERTIES MACOSX_BUNDLE_INFO_PLIST ${CMAKE_SOURCE_DIR}/res/info.plist.in)
 
-set(QT_LIBRARIES Qt5::Widgets Qt5::OpenGL)
+list(APPEND QT_LIBRARIES Qt5::Widgets Qt5::OpenGL)
 target_link_libraries(${BINARY_NAME}-qt ${PLATFORM_LIBRARY} ${OPENGL_LIBRARY} ${BINARY_NAME} ${QT_LIBRARIES})
 
 install(TARGETS ${BINARY_NAME}-qt RUNTIME DESTINATION bin BUNDLE DESTINATION /Applications)