Added missing initialization, which causes AP2 to crash on startup in ZTS.

sapi/apache2handler/php_functions.c

@@ -480,6 +480,9 @@ PHP_INI_END()
 
 static PHP_MINIT_FUNCTION(apache)
 {
+#ifdef ZTS
+	ts_allocate_id(&php_apache2_info_id, sizeof(php_apache2_info_struct), (ts_allocate_ctor) NULL, NULL);
+#endif
 	REGISTER_INI_ENTRIES();
 	return SUCCESS;
 }