Relocate ismnt() and fismnt() to util.c, for sharing with initctl

initctl cannot link with helpers.c, so let's relocate these helper
functions to util.c instead.  Need them to probe for cgroup support.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

src/helpers.c

@@ -564,55 +564,6 @@ void endfsent(void)
 }
 #endif	/* HAVE_GETFSENT */
 
-static int hasopt(char *opts, char *opt)
-{
-	char buf[strlen(opts) + 1];
-	char *ptr;
-
-	memcpy(buf, opts, sizeof(buf));
-	ptr = strtok(buf, ",");
-	while (ptr) {
-		if (!strcmp(ptr, opt))
-			return 1;
-
-		ptr = strtok(NULL, ",");
-	}
-
-	return 0;
-}
-
-int ismnt(char *file, char *dir, char *mode)
-{
-	struct mntent *mnt;
-	int found = 0;
-	FILE *fp;
-
-	fp = setmntent(file, "r");
-	if (!fp)
-		return 0;	/* Dunno, maybe not */
-
-	while ((mnt = getmntent(fp))) {
-		if (!strcmp(mnt->mnt_dir, dir)) {
-			if (mode) {
-				if (hasopt(mnt->mnt_opts, mode))
-					found = 1;
-			} else
-				found = 1;
-
-			break;
-		}
-	}
-	endmntent(fp);
-
-	return found;
-}
-
-/* Requires /proc to be mounted */
-int fismnt(char *dir)
-{
-	return ismnt("/proc/mounts", dir, NULL);
-}
-
 /**
  * Local Variables:
  *  indent-tabs-mode: t