ports/159926: [PATCH] lang/py-prolog: some cleanup

[Ruslan Mahmatkhanov]

Please note, that after update of lang/swi-pl (ports/161414) this port 
should be fixed to make it build with new version. This new patch 
includes all the changes from original pr, so it should be committed 
instead.

tinderbuild logs:
7.4: http://host5.webstroy.ru/tb/7.4/py27-prolog-0.1_3.log
8.2: http://host5.webstroy.ru/tb/8.2/py27-prolog-0.1_3.log

-- 
Regards,
Ruslan

Tinderboxing kills... the drives.
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