K 10
svn:author
V 5
tobik
K 8
svn:date
V 27
2019-07-16T15:49:35.131023Z
K 7
svn:log
V 495
lang/rust: Clean up more things

- Drop pre-install target: `make restage` should be run after a
  failed `make stage` to wipe out and repopulate the staging
  directory.  No need to hack around this.
- Drop RUST_MANIFESTS, it is only one value after r490852 and now
  only used once in post-install.
- Drop RUST_CHANNEL.  It is only used in do-configure.
- Drop LLNEXTGEN option.  There are no references to LLNextgen in
  the Rust sources, so it appears to not be used for anything
  anymore.

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