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This patch ensures that Tor checks if a given compression method is supported before printing the version string when calling `tor --library-versions`. Additionally, we use the `tor_compress_supports_method()` to check if a given version is supported for Tor's start-up version string, but here we print "N/A" if a given compression method is unavailable. See: https://bugs.torproject.org/21662
c2d1d949