[cairo] Windows Show Glyph Bug

[Gerdus van Zyl]

I found a bug that only appears on windows surface without alpha.
Surface with alpha uses the fallbacks and does not show this bug.
It looks like it's setting a clip when showing glyphs and does not
remove the clip again.
My cairo using code worked in 1.8.8 but does not in current git
version. See attached images for illustration and patch that fixes the
bug. Probably the wrong way to fix it but works in my limited testing
using my code.

thanks.

~Gerdus
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