winex11: add support for 32-bit DDBs

[Erich Hoover]

I noticed a problem with the icons in Wine when alt+tabbing today.  After
doing a regression test it appears that commit
c29cf0591976f96c3adb30c3c3b6db59f4983251 results in pixmaps that do not
always display properly when alt+tabbing (see attached screenshot).

Erich Hoover
ehoover at mines.edu
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