ext/intl: use RETURN_NEW_STR for intl_get*id_windows_id(). (php#18501)

for non interned return values.

Author: devnexen

ext/intl/timezone/timezone_methods.cpp

@@ -646,7 +646,7 @@ U_CFUNC PHP_FUNCTION(intltz_get_windows_id)
 	error = U_ZERO_ERROR;
 	winID = intl_convert_utf16_to_utf8(uWinID.getBuffer(), uWinID.length(), &error);
 	INTL_CHECK_STATUS(error, "could not convert time zone id to UTF-8");
-	RETURN_STR(winID);
+	RETURN_NEW_STR(winID);
 }
 /* }}} */
 
@@ -684,6 +684,6 @@ U_CFUNC PHP_FUNCTION(intltz_get_id_for_windows_id)
 	error = U_ZERO_ERROR;
 	id = intl_convert_utf16_to_utf8(uID.getBuffer(), uID.length(), &error);
 	INTL_CHECK_STATUS(error, "could not convert time zone id to UTF-8");
-	RETURN_STR(id);
+	RETURN_NEW_STR(id);
 }
 /* }}} */