don't fail if /etc/issue is not present
Summary: When running on macOS there is no /etc/issue. When running with `set -e` enabled, we don't want this to break the build. Neither of these is possible today, but will be later in this diff stack. While I'm in here, also print out the cmake version. Refs: https://github.com/facebook/watchman/pull/639 Reviewed By: snarkmaster Differential Revision: D9552416 fbshipit-source-id: 432b5b70678908de9f79787d37c3615a7f8649d3
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