cairo-version: fix docs build

We do some evil things in this doc comment by closing a <para> tag further up.
Make sure we reopen it at the end so that gtk-doc's attempt to close it again
doesn't result in an imbalance.
Merge branch 'master' of git://anongit.freedesktop.org/git/cairo
JOHNE - Accommodate the fact that <include_folder>\freetype2\freetype seems to have been changed to <include_folder>\freetype
JOHNE - Create (i.e. ensure the existence of) any folders that we'll need at build time