[Tile-serving] [osm2pgsql] Add cmake build scripts and appveyor.yml (#460)

[alex85k]

@pnorman : would you prefer optional CXXFLAGS like ```-Werror -pedantic -Wall`` as variable or inside CMakeLists.txt?

---
Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/460#issuecomment-148914065
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/tile-serving/attachments/20151017/6cf850d4/attachment.html>