Prune 5 obsolete ports

FreeBSD Ports maintainers have already deleted the following:
  databases/py-migrate
  devel/py-astng
  japanese/texfamily
  japanese/texfamily-vfn2a
  textproc/checkbashisms
Tweak graphics/ipe version 7.1.4
Tweak graphics/pho version 0.9.8