[Bug 38027] HyperStudio 5 (.NET 4.0 app) fails to start, reports 'tiff_get_decode_info unhandled grayscale sample count 2'

https://bugs.winehq.org/show_bug.cgi?id=38027

--- Comment #3 from Dmitry Timoshkov <dmitry(a)baikal.ru> ---
Created attachment 50759
  --> https://bugs.winehq.org/attachment.cgi?id=50759
patch

This tiff file contains a 8 bpp grayscale image with additional 8 bpp aplha
channel. wincodecs don't have a proper image format for this combo and under
windows WIC Explorer shows that WIC internally converts this image to 32 bpp
PBGRA format.

Attached patch adds support for this tiff file by ignoring alpha channel.
Adding proper support for it shouldn't be too hard for an interested person.

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