Visual Studio Fix, RPATH handling improvement #41
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Corrected an issue I reported in UDUNITS-2 #40, e.g. Visual-Studio based Windows builds were broken due to a dependency on unistd.h introduced by flex. This issue was corrected in CMake-based builds, as these are the only type of builds on Windows that use Visual Studio.
I also added some cmake configuration for handling RPATH values post-install. This squelches an OSX-specific cmake warning that was being reported, and addresses some linux corner cases.