Add missing include of fcntl.h

Fixes https://github.com/libsdl-org/SDL/issues/11590

src/file/io_uring/SDL_asyncio_liburing.c

@@ -31,6 +31,7 @@
 
 #include <liburing.h>
 #include <errno.h>
+#include <fcntl.h>
 #include <string.h>  // for strerror()
 
 static SDL_InitState liburing_init;