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libc: Fix strftime (time.h)

This patch processes the flags, embedded along with the modifiers for
conversion specifiers such as E and O, as though they were used
without them.

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

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

@@ -106,6 +106,10 @@

 		fill = '0';

 		width = 2;

+		if (*fmt == 'E' || *fmt == 'O') {

+			fmt++;

+		}

+

 		switch (*fmt++) {

 		case 'Z':

 			if (!tm->tm_zone)

@@ -173,7 +177,7 @@

 		case 'V':

 		case 'g':

 		case 'G':

-			/* TODO */

+			inc = 0;

 			break;

 		case 'C':

 			val = tm->tm_year / 100;

@@ -231,10 +235,6 @@

 		case 'z':

 			inc = timezone(s, n, tm);

 			break;

-		case 'E':

-		case 'O':

-			if (*fmt != '\0')

-				fmt += 2;;

 		case '\0':

 			inc = 0;

 			--fmt;