[CFT] games/linux-nwnclient port

[Sean C. Farley]

I am not sure anyone still has or plays Neverwinter Nights Original or 
Diamond editions, but I have updated the ports to chase after the 
locations of the files that the ports download.  If anyone could test 
and review the ports, especially before the 2017-11-09 deadline :), I 
would appreciate it.

I posted a diff of the changes for review[1].

Thank you!

Sean
   1. https://reviews.freebsd.org/D12960
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