[REVIEW 3-6] Fix squashed glyphs with Cairo canvas

[Jan Holesovsky]

Hi Thorsten,

Can you please cherry-pick

http://cgit.freedesktop.org/libreoffice/core/commit/?id=638f6cb6a666aa611d3e0bef5a29e5824b0574ee

to libreoffice-3-6?

It fixes

https://bugzilla.novell.com/show_bug.cgi?id=681110 [public]

It smells very similar to

https://bugs.freedesktop.org/show_bug.cgi?id=55931

Again we are (mis?)using font metrics to behave differently in the
x-axis, while doing the right thing with y :-)  I believe we just
shouldn't do such things.

All the best,
Kendy