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Brad King authored
Revert the change from commit 7b354baa (CMakeVersion: Set CMake_VERSION_RC to 0 even in non-rc versions, 2019-07-25) and instead define a `0` value in `CMake_VERSION_RC` to mean `-rc0`. This distinguishes release branch versions prior to the first release candidate from the first release candidate itself. It also makes room for a dedicated "CMake $major.$minor.0-rc1" release commit for `-rc1` as we have for later release candidates and final releases.
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