build: enable IWYU on mac

src/nvim/ui_compositor.c

@@ -7,9 +7,9 @@
 #include <inttypes.h>
 #include <limits.h>
 #include <stdbool.h>
-#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/types.h>
 
 #include "klib/kvec.h"
 #include "nvim/api/private/defs.h"