devel/py-virtualenv: Fix build when a previous version is installed

- Pass the option --ignore-installed to pip(1), because it tries to deinstall
  the  previous version when installing the new one. This is safe because we
  install it in the stage dir. [1]

- Fix build with Python < 3.9.
  Replace the switch -s (strip) with -d (destination dir), passed to module
  compileall.py, because the first is available only with Python 3.9+. [2]

  Reported error:

===>  Staging for py38-virtualenv-20.18.0
===>   Generating temporary packing list
Using pip 22.3.1 from /usr/local/lib/python3.8/site-packages/pip (python 3.8)
Processing ./dist/virtualenv-20.18.0-py3-none-any.whl
Installing collected packages: virtualenv
  changing mode of /wrkdirs/usr/ports/devel/py-virtualenv/work-py38/stage/usr/local/bin/virtualenv to 755
Successfully installed virtualenv-20.18.0
WARNING: There was an error checking the latest version of pip.
/usr/local/bin/python3.8 /usr/local/lib/python3.8/compileall.py -s /wrkdirs/usr/ports/devel/py-virtualenv/work-py38/stage -f /wrkdirs/usr/ports/devel/py-virtualenv/work-py38/stage/usr/local/lib/python3.8/site
-packages
usage: compileall.py [-h] [-l] [-r RECURSION] [-f] [-q] [-b] [-d DESTDIR]
                     [-x REGEXP] [-i FILE] [-j WORKERS]
                     [--invalidation-mode {checked-hash,timestamp,unchecked-hash}]
                     [FILE|DIR [FILE|DIR ...]]
compileall.py: error: unrecognized arguments: -s /wrkdirs/usr/ports/devel/py-virtualenv/work-py38/stage/usr/local/lib/python3.8/site-packages
*** Error code 2

PR:		269458 [1]
Reported by:	John Hein <jcfyecrayz@liamekaens.com> [1]
Reported by:	Кирилл Варнаков <kirill@varnakov.com> (via email) [2]

0 files changed, 0 insertions, 0 deletions