Fix compilation with pycairo 1.17.x

Eli Schwartz requested to merge eschwartz/pitivi:master into master

Do not redefine a thing which was always defined in the included header, since that breaks when upstream changes how they do things.

This is a holdover from the initial python2 version, since pycairo dropped the use of downstream definition of Pycairo_CAPI during the python3 port:

See for the upstream change that broke this misuse.

Edited by Eli Schwartz

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