suppress compiler warning

src/misc/misc_time.c

@@ -33,6 +33,7 @@ typedef struct timeval {
 */
 int gettimeofday(struct timeval * tp, void * unused)
 {
+    NG_IGNORE(unused);
     // Note: some broken versions only have 8 trailing zero's, the correct epoch has 9 trailing zero's
     // This magic number is the number of 100 nanosecond intervals since January 1, 1601 (UTC)
     // until 00:00:00 January 1, 1970