winex11/dib: Fix GetDIBits of 1 bit DDBs (post 1.0 resend)

[Michael Karcher]

1 bpp DDBs seem to always carry an implicit palette of black and white,
regardless of what the DC says. Based on a patch from Eric Pouech,
available at <http://bugs.winehq.org/attachment.cgi?id=12492>.
---
 dlls/gdi32/tests/bitmap.c |    5 +----
 dlls/winex11.drv/dib.c    |   15 +++++++++++++--
 2 files changed, 14 insertions(+), 6 deletions(-)
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