[Bug 263661]

[Karlt]

Created attachment 532740
use RepeatPad on newer X servers even when downscaling

This was based on Joe's attachment 497112, but restores the use of
aDefaultFilter when we use EXTEND_PAD and adds aDefaultFilter for downscale
with default extend.

There is also some code simplification.  We now require cairo 1.10 so there is
no need to check the cairo version.

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https://bugs.launchpad.net/bugs/263661

Title:
  Black Line appears next to gif and png images

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