[AD] Fixed crash in AL5 git dialog

[Nick Trout <chinbillybilbo@xxxxxxxxxx>]

Just run any of the examples where an abort happens on iOS. Happens because display stored in TLS, so it can't get the view.

Seems to be a common problem with updating to Xcode 4.5 (4.4?). Seems to happen with iOS 5.1 and 6.

https://www.allegro.cc/forums/thread/611890

Solution was to get the display and view on the thread that created them and pass them to the main thread. 

Patch attached.

BQ

Attachment: ios_dialog_patch.diff
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