Fix Minijail's getopt string.

"-F" option does not exist.

BUG=None
TEST=security_Minijail0

Change-Id: I7463288d0555636d1c96373e61494082738111bd
Reviewed-on: https://gerrit.chromium.org/gerrit/28876
Tested-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Commit-Ready: Jorge Lucangeli Obes <jorgelo@chromium.org>
diff --git a/minijail0.c b/minijail0.c
index 997b9d9..9f2a765 100644
--- a/minijail0.c
+++ b/minijail0.c
@@ -105,7 +105,7 @@
 	struct minijail *j = minijail_new();
 
 	int opt;
-	while ((opt = getopt(argc, argv, "u:g:sS:c:C:b:vrGhHnpF")) != -1) {
+	while ((opt = getopt(argc, argv, "u:g:sS:c:C:b:vrGhHnp")) != -1) {
 		switch (opt) {
 		case 'u':
 			set_user(j, optarg);