[pygame] font.get_fonts and OS X

[Lenard Lindstrom]

Currently I am filling in the font unit tests. For OS X I noticed that 
sysfont.py does not hunt down installed fonts. The relevant function is 
a stub. I have no OS X access, so can't write it myself. Is someone else 
willing to take care of it. Otherwise when I commit the completed unit 
tests they will fail for OS X.

Lenard