UI: Remove Qt5MacExtras

QtMacExtras is currently not in Qt6 and there's no word on if/when it
will be reintroduced. We don't appear to be using it, so let's remove
it.

UI/CMakeLists.txt

@@ -52,10 +52,6 @@ find_package(Qt5Xml ${FIND_MODE})
 
 find_package(FFmpeg REQUIRED COMPONENTS avcodec avutil avformat)
 
-if(APPLE)
-	find_package(Qt5MacExtras REQUIRED)
-endif(APPLE)
-
 if(NOT Qt5Widgets_FOUND)
 	if (ENABLE_UI)
 		message(FATAL_ERROR "Failed to find Qt5")
@@ -412,10 +408,6 @@ target_link_libraries(obs
 	${LIBCURL_LIBRARIES}
 	${obs_PLATFORM_LIBRARIES})
 
-if (APPLE)
-	target_link_libraries(obs
-			Qt5::MacExtras)
-endif()
 set_target_properties(obs PROPERTIES FOLDER "frontend")
 
 define_graphic_modules(obs)