[pgpointcloud] Homebrew formula

[Pete Gadomski]

> It might be easier to submit this to osgeo4mac, which contains a ton
> of other OSGeo software.

+1. I hadn't run across https://github.com/OSGeo/homebrew-osgeo4mac.
I've closed my pull request on Homebrew/homebrew and will resubmit
both formula to OSGeo/homebrew-osgeo4mac.

Cheers,
Pete

-- 
Pete Gadomski
Physical Scientist
Cold Regions Research & Engineering Lab
pete.gadomski at gmail.com
530.440.4630