xbps-triggers: added support for additional python versions in pycompile.
xbps-src: added "pycompile_version" to specify python version used in the pycompile trigger.
python3.4: added pycompile trigger support.
xbps-triggers: remove __pycache__ dirs at remove time.
xbps-triggers: improve removal of __pycache__ dirs.
python3.4: remove tests that fail to be byte-compiled.
python-setuptools: added pycompile support for the 3.4 subpkg.