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Cocoa UI always crashes on startup

Commit 8bb93c6f99a42c2e0943bc904b283cd622d302c5 ("ui/console: ensure graphic updates don't race with TCG vCPUs") causes the graphic update to run on a non-main thread, which Cocoa is not happy with. It crashes immediately after startup.

$ i386-softmmu/qemu-system-i386 
2017-03-22 10:09:25.113 qemu-system-i386[15968:9538245] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'nextEventMatchingMask should only be called from the Main Thread!'
*** First throw call stack:
(
	0   CoreFoundation                      0x00007fff91e72e7b __exceptionPreprocess + 171
	1   libobjc.A.dylib                     0x00007fffa6a5ccad objc_exception_throw + 48
	2   AppKit                              0x00007fff900953fd -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 4471
	3   qemu-system-i386                    0x0000000104f75a49 cocoa_refresh + 233
	4   qemu-system-i386                    0x0000000104e0312c process_queued_cpu_work + 140
	5   qemu-system-i386                    0x0000000104d1a73c qemu_tcg_rr_cpu_thread_fn + 284
	6   libsystem_pthread.dylib             0x00007fffa7557aab _pthread_body + 180
	7   libsystem_pthread.dylib             0x00007fffa75579f7 _pthread_body + 0
	8   libsystem_pthread.dylib             0x00007fffa75571fd thread_start + 13
)
libc++abi.dylib: terminating with uncaught exception of type NSException
Abort trap: 6

System: macOS 10.12.3, Xcode 8.2.1