macOS: Detect use of heap-allocated QMacAutoReleasePool

QMacAutoReleasePool is backed by an NSAutoreleasePool, which documents that
"you should always drain an autorelease pool in the same context (invocation
of a method or function, or body of a loop) that it was created".

This means allocating QMacAutoReleasePool on the heap is not a supported
use-case, but unfortunately we can't detect it on construction time.

Instead we detect whether or not the associated NSAutoreleasePool has been
drained, and prevent a double-drain of the pool.

Change-Id: Ifd7380a06152e9e742d2e199476ed3adab326d9c
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

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