patch 8.2.4155: translating strftime() argument results in check error

Problem:    Translating strftime() argument results in check error.
Solution:   Add gettext comment.
diff --git a/src/time.c b/src/time.c
index 75e7b25..020f78d 100644
--- a/src/time.c
+++ b/src/time.c
@@ -93,6 +93,7 @@
 	vim_strncpy((char_u *)buf, (char_u *)_("(Invalid)"), sizeof(buf) - 1);
     else
     {
+	// xgettext:no-c-format
 	(void)strftime(buf, sizeof(buf) - 1, _("%a %b %d %H:%M:%S %Y"),
 								    curtime);
 # ifdef MSWIN