Removed PS2 compiler definition

This is already defined as part of the PS2 SDK

CMakeLists.txt

@@ -2766,8 +2766,6 @@ elseif(PSP)
   )
 
 elseif(PS2)
-  sdl_compile_definitions(PRIVATE "PS2" "__PS2__")
-
   sdl_glob_sources("${SDL3_SOURCE_DIR}/src/main/ps2/*.c")
 
   if(SDL_AUDIO)