Patch to support 32 bit DRI clients on 64bit platforms

[Egbert E. <ei...@fr...>]

I've put a patch to add support for mixed 32/64 DRI clients on 64bit
platforms to bugzilla:

http://freedesktop.org/bugzilla/show_bug.cgi?id=943

I've used this patch for quite a while now. The version in bugzilla
applies to Mesa6 as in the X.Org CVS head.

Egbert.