Fix BitBlt

[Maxime Bellengé]

The game neverwinter nights uses a lot of MaskBlt on its startup screen.
The game was crashing with BadDrawable X error messages.

This was caused by bitblt using the XCopyArea function when there is no
source. Some MaskBlt operations can generate such things, as the list of
different masks on MSDN shows.

ChangeLog:
    * Prevent a crash with a BadDrawable X error message with some
MaskBlt calls.

-- 
Maxime Bellengé <maxime.bellenge at laposte.net>
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