devel/py-pythran: Allow build with py-beniget 0.5.0+
- While I'm here, remove outdated post-extract:
- Bump PORTREVISION for package change
Approved by: portmgr (blanket)
Obtained from: https://github.com/serge-sans-paille/pythran/commit/3690121152403dc4fb4fe50bb5837007f7a4de68