Support using system-installed GTest #61
Merged
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Adds CMake option for using a local GoogleTest installation when downloading at build time is not desired/allowed.
My personal motivation for this feature is to support running the unit tests while packaging for Nix, which doesn't allow networking at build time. I think a fair number of other package managers also prohibit networking at build time, although I don't know how common it is to try to run upstream tests.