basic + fundamental: Clean up includes

Split out of #37344.

src/basic/limits-util.h

@@ -1,7 +1,7 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 #pragma once
 
-#include <inttypes.h>
+#include "forward.h"
 
 uint64_t physical_memory(void);
 uint64_t physical_memory_scale(uint64_t v, uint64_t max);