* PyQt could not be installed for multiple Python versions at
the same time, as there were conflicting files.
This patch creates Python-version versioned directories for
all these, and further installs binaries with a version number.
* Note, there might be some hickups for software that depends on
on of the .so's provided by PyQt5, which might not be found
anymore autmotically, and maybe need some LD-flaggery.
* Update PyQt5 to 5.10.1
* Mark www/py-qt5-webengine broken. It is unforuntately no longer
compatible with the old qt5-webengine-5.9.4 we ship.
PR: 232745
Exp-run by: antoine
Differential Revision: https://reviews.freebsd.org/D8714
cc8a667aa2