Qt: Don't link against SDLMAIN, Qt already handles that. (#551)

src/platform/qt/CMakeLists.txt

@@ -22,7 +22,7 @@ if(BUILD_SDL)
 	if(SDL2_FOUND)
 		link_directories(${SDL2_LIBDIR})
 	endif()
-	list(APPEND PLATFORM_LIBRARY ${SDL_LIBRARY} ${SDLMAIN_LIBRARY})
+	list(APPEND PLATFORM_LIBRARY ${SDL_LIBRARY})
 	list(APPEND PLATFORM_SRC ${PLATFORM_SRC} ${CMAKE_SOURCE_DIR}/src/platform/sdl/sdl-events.c ${CMAKE_SOURCE_DIR}/src/platform/sdl/sdl-audio.c)
 	include_directories(${SDL_INCLUDE_DIR} ${CMAKE_SOURCE_DIR}/src/platform/sdl)
 endif()

src/platform/qt/main.cpp

@@ -3,6 +3,10 @@
  * This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// This must be defined before anything else is included.
+#define SDL_MAIN_HANDLED
+
 #include "GBAApp.h"
 #include "Window.h"
 
@@ -22,6 +26,9 @@ Q_IMPORT_PLUGIN(QWindowsAudioPlugin);
 #endif
 
 int main(int argc, char* argv[]) {
+#ifdef BUILD_SDL
+	SDL_SetMainReady();
+#endif
 	QGBA::GBAApp application(argc, argv);
 
 	QLocale locale = QLocale::system();