Reference -fPIC only once, and don't use it on Windows
Merge pull request #201 from leapmotion/fix-fpic

Reference -fPIC only once, and don't use it on Windows
Adding capability to build on Arm-Linux

Instructions have been added to inform users of how to build Autowiring for Arm-Linux targets.  The only requirement, outside of the toolchain installation proper, is a local installation of "boost," otherwise autonet cannot be built.

Libraries built to target arm will have "Arm" as a suffix to differentiate them from other target architectures.