PATCH: fix build with X.org 7.2

[Rene Ladan]

Gerald Pfeifer schreef:
> Building WIne 0.9.31 with X.org 7.2 fails on FreeBSD, and probably other 
> platforms.
>
Wine 0.9.32 also fails with X.org 7.2/FreeBSD without the patch.

> Specficially, the symbols XauGetBestAuthByAddr and XauDisposeAuth have 
> are no longer in libXt but libXau, so we need to add a configure check
> for libXau.
>
[...patch...]

Rene
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