basic + fundamental: Clean up includes

Split out of #37344.

src/basic/random-util.c

@@ -1,28 +1,20 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 
 #include <elf.h>
-#include <errno.h>
 #include <fcntl.h>
 #include <linux/random.h>
-#include <stdbool.h>
-#include <stdint.h>
-#include <stdlib.h>
 #include <string.h>
 #include <sys/auxv.h>
 #include <sys/ioctl.h>
-#include <sys/time.h>
 #include <threads.h>
 
 #include "alloc-util.h"
-#include "env-util.h"
-#include "errno-util.h"
 #include "fd-util.h"
 #include "fileio.h"
 #include "io-util.h"
 #include "iovec-util.h"
 #include "log.h"
 #include "missing_random.h"
-#include "missing_syscall.h"
 #include "parse-util.h"
 #include "pidfd-util.h"
 #include "process-util.h"