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

[Greg Troxel]

@pnorman @alex85k  I've rerun with alex85k's exported variables, and then looked at ktrace to see what NAMI lookups were made.  It seems that the gcc 4.8 include files are being found, but then it dawned on me that I have boost built with the system gcc (4.5).   And since you can't mix gcc versions with C++, that's not going to work.   So this means I'd have to rebuild boost with 48.   Since this did work fine on NetBSD 7 which has gcc 48 native (and thus boost/etc.) were built with it, I'm going to declare victory.

I don't know if it's my lack of familiarity with cmake, or the docs, but it might be good for the README.md to explain what has to be put in which cmake variables to support alternative compilers and more importantly dependencies in a prefix other than /usr.

I also wonder if all of the exported variables alex85k put in are really necessary.  While i can see the point, it seems like it shouldn't be required (on redhat or on my netbsd system).

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