Sphinx 1.7 removed sphinx.util.compat after being deprecated for a while.
Here is a patch to fix the package for sphinx 1.7, could you add it to the PKGBUILD for now? I also sent it to upstream through mail so it should be fixed soon.
https://mel.vin/sphinxcontrib-tikz-sphinx1.7-fix.diff
Thanks.
@melvinvermeeren,
Thanks for the patch!