MailCore/mailcore2 — pull request #781 by siberianisaev (2014-07-03 14:01:08+00:00)
Title: dispatch_queue_t property: check OS_OBJECT_HAVE_OBJC_SUPPORT

Fixed compile error "Property with retain (or strong) attribute must be object type" (iOS < 6).

![screenshot](https://dl.dropboxusercontent.com/u/25357310/dispatch_queue_t.png)