basic + fundamental: Clean up includes

Split out of #37344.

src/basic/argv-util.h

@@ -1,23 +1,12 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 #pragma once
 
-#include <stdbool.h>
-
-#include "assert-util.h"
-#include "macro.h"
+#include "forward.h"
 
 extern int saved_argc;
 extern char **saved_argv;
 
-static inline void save_argc_argv(int argc, char **argv) {
-        /* Protect against CVE-2021-4034 style attacks */
-        assert_se(argc > 0);
-        assert_se(argv);
-        assert_se(argv[0]);
-
-        saved_argc = argc;
-        saved_argv = argv;
-}
+void save_argc_argv(int argc, char **argv);
 
 bool invoked_as(char *argv[], const char *token);
 bool invoked_by_systemd(void);