mount: don't overwrite mount flags by MS_STRICTATIME

It's typo fix. MS_STRICTATIME has to be added to other flags there.

travis-ci: success for mount: don't overwrite mount flags by MS_STRICTATIME
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

criu/proc_parse.c

@@ -1197,7 +1197,7 @@ static int parse_mnt_flags(char *opt, unsigned *flags)
 
 	/* Otherwise the kernel assumes RELATIME by default */
 	if ((*flags & (MS_RELATIME | MS_NOATIME)) == 0)
-		*flags = MS_STRICTATIME;
+		*flags |= MS_STRICTATIME;
 
 	return 0;
 }