Remove HAVE_STRFTIME

Function strftime is part of the C89 standard [1] and current systems
don't need to check for its presence anymore.

Additionally, checks for strftime function in tests have been removed
since the PHP strftime function is now always available.

1: https://port70.net/~nsz/c/c89/c89-draft.html

Author: petk

ibase_query.c

@@ -1396,22 +1396,7 @@ static int _php_ibase_var_zval(zval *val, void *data, int type, int len, /* {{{
 			if (flag & PHP_IBASE_UNIXTIME) {
 				ZVAL_LONG(val, mktime(&t));
 			} else {
-#if HAVE_STRFTIME
 				l = strftime(string_data, sizeof(string_data), format, &t);
-#else
-				switch (type & ~1) {
-					default:
-						l = slprintf(string_data, sizeof(string_data), "%02d/%02d/%4d %02d:%02d:%02d", t.tm_mon+1, t.tm_mday,
-							t.tm_year + 1900, t.tm_hour, t.tm_min, t.tm_sec);
-						break;
-					case SQL_TYPE_DATE:
-						l = slprintf(string_data, sizeof(string_data), "%02d/%02d/%4d", t.tm_mon + 1, t.tm_mday, t.tm_year+1900);
-						break;
-					case SQL_TYPE_TIME:
-						l = slprintf(string_data, sizeof(string_data), "%02d:%02d:%02d", t.tm_hour, t.tm_min, t.tm_sec);
-						break;
-				}
-#endif
 				ZVAL_STRINGL(val, string_data, l);
 				break;
 			}