Updates to cmake to work around missing statics #231
Merged
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Setup CMAKE to require C++17 - this helps with places where the default compiler does not (Centos 7) and errors out early
Also, configure to avoid making the "combined custom" library libbls.a if the platform does not have the static versions of libgmp or libsodium. The library and test programs still work, however, because the dynamic version will be linked to the executable (ie runtest, etc)
This does mean on such a system that when using libbls.a one does need to link to the dynamic libraries, but this is preferable to not building at all and throwing strange errors. This should fix issue #225