CMake: Prevent double SDL2 and SDL2main entries in sdl2.pc

CMakeLists.txt

@@ -3158,7 +3158,7 @@ endif()
 
 # Clean up the different lists
 listtostr(EXTRA_LIBS _EXTRA_LIBS "-l")
-set(SDL_STATIC_LIBS ${SDL_LIBS} ${EXTRA_LDFLAGS} ${_EXTRA_LIBS})
+set(SDL_STATIC_LIBS ${EXTRA_LDFLAGS} ${_EXTRA_LIBS})
 list(REMOVE_DUPLICATES SDL_STATIC_LIBS)
 listtostr(SDL_STATIC_LIBS _SDL_STATIC_LIBS)
 set(SDL_STATIC_LIBS ${_SDL_STATIC_LIBS})