BUG: wxMac 2.8.0 drawing sample, logical op

[Thomas Jansson]

I recently upgraded to wxMac 2.8.0 from wxMac 2.6.3 and came across an 
issue with wxAND when drawing.
I checked with the included drawing sample and it doesn't draw every 
operation properly (going to the Mask screen, F6 where you see the stars).

I built wxMac 2.8.0 with these configurations (on MacOS X 10.4)

../configure --disable-shared --enable-universal_binary --with-opengl

then built the sample using the included makefile in 
build-osx/samples/drawing (by running make).

The result is I don't get anything on operations other than the original 
image, with colour mask, the mask image, masked image and wxCOPY.

(The wxMSW 2.8.0 and samples built okay using VS express)

Hopefully this will be enough for someone to find the problem.