LibC: Add missing include in utime.h

<sys/types.h> declares the `utimbuf` struct used by this header.

Fixes #25899

Author: spholz

Userland/Libraries/LibC/utime.h

@@ -7,6 +7,7 @@
 #pragma once
 
 #include <sys/cdefs.h>
+#include <sys/types.h>
 
 __BEGIN_DECLS