mk: Update how the build deals with version labels. #16677 #17285
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Adds a new configure flag, --release-channel, which determines how the version
number should be augmented with a release label, as well as how the distribution
artifacts will be named. This is entirely for use by the build automation.
--release-channel can be either 'source', 'nightly', 'beta', or 'stable'.
Here's a summary of the affect of these values on version number and
artifact naming, respectively:
Per http://discuss.rust-lang.org/t/rfc-impending-changes-to-the-release-process/508/1
The only immediate practical impact of this is that nightlies will now be versioned
0.12.0-nightly
instead of0.12.0-pre-nightly
.r? @alexcrichton