[poppler] Bugfix proposal for Shading Type 6 and 7

[Christian Feuersaenger]

Hello Albert,

I've managed to fix a bug in the Shading Type 6/7 (Coons & cubic tensor 
patches) implementation.

The bugfix is small and stable (in my eyes); the poppler-0.14 branch 
doesn't implement support for parameterized patch shadings. I modified 
the existing implementation accordingly with relatively few changes.

Attached you find the patch file and the updated test.pdf to see the 
improvement.

The file type4567patch.... also includes the patch of my previous mail 
(they only share the same refinement threshold).

The patch should work relative to poppler-0.14.0-3-gb2427d0 .

Best regards

Christian
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