Properly set status 'missing' for missing binaries and/or env files

When we try to start a service/run/task we call whichp() to see if the
binary exists, either tha absolute path given in the .conf file, or in
the $PATH we run with.  If binary, or the env: file, doesn't exist we
now set svc_missing() state.

On `initctl reload` we unblock the service to be able to check again.

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

src/svc.c

@@ -534,6 +534,9 @@ int svc_enabled(svc_t *svc)
 	if (svc_is_removed(svc) || svc_is_blocked(svc))
 		return 0;
 
+	if (svc_is_missing(svc))
+		return 0;
+
 	return 1;
 }