GpgEX: Allow updating through Gpg4win
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Description

In COM there exists the call "DllCanUnloadNow" which can return true if nothing is going on in GpgEX.

This call can be triggered by a call to CoFreeUnusedLibraries which afaik can be triggered through a WindowMessage claiming that the system is in a low memory state.

This could allow updating GpgEX while the windows explorer is still running.