basic + fundamental: Clean up includes

Split out of #37344.

src/basic/string-table.h

@@ -2,11 +2,7 @@
 
 #pragma once
 
-#include <stddef.h>
-#include <stdio.h>
-#include <sys/types.h>
-
-#include "macro.h"
+#include "forward.h"
 
 const char* string_table_lookup_to_string(const char * const *table, size_t len, ssize_t i) _const_;