devel/py-freebsd: Update to 0.9.4

• Switch to GitHub (sobomax fork of perky's upstream)
• This update includes Python 3.x support
• Add test target (and adjust PYDISTUTILS_BUILD_TARGET to build in-place)
• Remove patches (upstreamed)

PR: 233781
Submitted by: sobomax (based on)
Approved by: portmgr (maintainer timeout)