[cairo] Regression in stroker

[Adrian Johnson]

The attached PDF when viewed with the latest git poppler and cairo has a
round cap missing and one of the round joins has been clipped.

According to git bisect the regression was introduced by the cairo commit:

  afbd82671fe5ebebe5d58bef3d372312be1c5aeb
  "Optimize stroker by hoisting some calculations out of loops"

The PDF file is the output from the caps-join test with an optimization
to avoid transforming to the user space ctm when stroking for some
common cases where it makes no difference to the stroke.

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