No need for usage()

There are 2 arguments why -v and -h are broken:

	1) if you are running off git, -v will show the last stable
           release, effectively making this option useless.
           people running stable versions leave open an attack surface
           this way in case there are vulnerabilities found.
           99% of the people are also using package managers to keep
           their software up to date, instead of running $TOOL -v to
           check how old it is.
        2) -h is a sad excuse for not just looking at the manual page
           (man 1 slock). Given we accept a post_lock_command, we can't
           be as liberal and just intercept certain flags.

I changed the manpage to reflect this change.

slock.c

@@ -272,27 +272,15 @@ lockscreen(Display *dpy, int screen)
 	return NULL;
 }
 
-static void
-usage(void)
-{
-	fprintf(stderr, "usage: slock [-v|POST_LOCK_CMD]\n");
-	exit(1);
-}
-
 int
-main(int argc, char **argv) {
+main(int argc, char **argv)
+{
 #ifndef HAVE_BSD_AUTH
 	const char *pws;
 #endif
 	Display *dpy;
 	int screen;
 
-	if ((argc == 2) && !strcmp("-v", argv[1]))
-		die("slock-%s, © 2006-2016 slock engineers\n", VERSION);
-
-	if ((argc == 2) && !strcmp("-h", argv[1]))
-		usage();
-
 #ifdef __linux__
 	dontkillme();
 #endif