python_dependency: cleanup and fix build env.

* Only set PYTHONPATH for Python 2.
* Set the Python binary for superenv.

References #24842.
Closes #26197.
Closes #26216.
Closes #26218.
Closes #26228.
jena 2.11.1

Current formula does not work as v2.11.0 no longer hosted at specified URL.

Closes #26238.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
phantomjs 1.9.7

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
phantomjs: add 1.9.7 bottle.

Closes #26240.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
kvazaar 0.2.0