Remove some uneeded headers

usr.sbin/pw/grupd.c

@@ -35,10 +35,6 @@ static const char rcsid[] =
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <unistd.h>
-#include <stdarg.h>
-#include <sys/types.h>
-#include <sys/stat.h>
 #include <sys/param.h>
 
 #include "pwupd.h"

usr.sbin/pw/pw_nis.c

@@ -29,9 +29,6 @@ static const char rcsid[] =
   "$FreeBSD$";
 #endif /* not lint */
 
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
 #include <sys/types.h>
 #include <err.h>
 #include <pwd.h>

usr.sbin/pw/pw_user.c

@@ -40,7 +40,6 @@ static const char rcsid[] =
 #include <sys/types.h>
 #include <sys/time.h>
 #include <sys/resource.h>
-#include <unistd.h>
 #include <login_cap.h>
 #include <pwd.h>
 #include <grp.h>