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libc: Fix bug in mktime.c

tm_year should never be negative.

--- a/src/libc/time/mktime.c

+++ b/src/libc/time/mktime.c

@@ -42,6 +42,9 @@

 		return 0;

 	}

+	if (tm->tm_year < 0)

+		return 0;

+

 	day = tm->tm_mday;

 	yday = 0;

 	year = 1900 + tm->tm_year;

@@ -49,7 +52,7 @@

 	for (mon = tm->tm_mon; day < 1; --mon) {

 		if (mon == JAN) {

-			if (year == EPOCH)

+			if (year == 1900)

 				return 0;

 			year--;

 			_daysmon[FEB] = FEBDAYS(year);