A workaround against Emacs crash when displaying images

[Katsumi Yamaoka]

On Fri, 08 Mar 2019 13:04:40 +0100, Corinna Vinschen wrote:
> I could reproduce the hang and found a potential deadlock situation.
> I pushed a fix and uploaded new developer snapshots to
> https://cygwin.com/snapshots/

> Please test.

All seems to work fine on 3.0.3.  Thank you!

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