[Build] Bump minimum libc to 2.17 for release binaries #1770
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Bump up the minimum supported libc version to 2.17, which is necessary moving forward with sapling work.
2.17 was chosen as that is what CentOS 7 includes, which won't reach EOL until 2024.
Also included here are a couple cleanups for checks or backwards compatibility code that are rendered moot with the libc version bump.