[poppler] Implement Type 4, 5, 6, 7 shadings using cairo mesh gradients

[Carlos Garcia Campos]

Cairo 1.11.2 has a new mesh pattern that can be used to implement 6/7
type gradients. Adrian has an updated poppler branch that implements
mesh gradients in cairo backend:

http://cgit.freedesktop.org/~ajohnson/poppler/log/?h=mesh

I've tried it and it works great, it fixes bugs #28836 and #32791 (and
maybe others). I haven't pushed the patch yet becuase it contains
minimal changes in Gfx.cc. If nobody objects I'll push it to master
branch only.

Regards,

-- 
Carlos Garcia Campos
PGP key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x523E6462
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