Rename `hexagon-unknown-{none-elf,linux-musl}` targets

[androm3da]

Rename hexagon-unknown-{none-elf,linux-musl} targets

• Rename hexagon-unknown-linux-musl target to hexagon-linux-musl
• Rename hexagon-unknown-none-elf target to hexagon-none-elf

Rationale

Let's simplify the target name by omitting the implied vendor element. If one or both targets above become vendored targets, those ones must explicitly name the vendor and the vendored target must be added (or it should replace the un-vendored target, if appropriate).

These tier 3 targets see somewhat narrow Rust use so far and it makes sense to change the names now before we take effort to promote them to higher tiers.

Mentors or Reviewers

@tgross35 might make a good mentor/reviewer.

Process

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  • Outstanding concerns will block the Final Comment Period from finishing. Once all concerns are resolved, the 10 day countdown is restarted.
  • If no concerns are raised after 10 days since the resolution of the last outstanding concern, the MCP is considered approved.

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[rustbot]

Important

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cc @rust-lang/compiler

[androm3da]

cc @crsabotta