add MacPorts build

Tested on Mac OS 10.9.4 with Macports 2.3.1
Both ncurses and tiles builds are OK.

But with another patch: #8338 
I'm strongly tempted to just add the call to ncursesw5-config there unconditionally and just see if it pans out for people, it's the right thing to do for all modern versions of ncurses from what I understand.