Add support for RPM compatible version compare #108
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I have a library that implements RPM compatible version comparisons, which I had written for use in two different previous projects (a pkg-config library I had been considering and a C++ implementation of Meson). The library itself is pretty simple, but not having another implementation of RPM-compatible version compare seems very desirable to me.
We would need to have better cmake support for fetch content in rpm-version, and we would need to wire this into the CMake build. which leads me to the other question I have, do we want to allow building without rpm-version support? I've currently wired it up as optional, and I see value in that since some people may not care about rpm compatible version comparisons and it is one less dependency. On the other hand it simplifies our process a lot of we can just assume there is rpm support.
TODO: needs some tests
TODO: rpm-version cmake support needs to land (dcbaker/rpm-version#8)