Remove include of stdint.h. It was added in r241014 for uintmax_t,

which is gone in r340330 and is therefore no longer necessary.

MFC after:	2 weeks

bin/rm/rm.c

@@ -54,7 +54,6 @@ __FBSDID("$FreeBSD$");
 #include <grp.h>
 #include <locale.h>
 #include <pwd.h>
-#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>