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

The main points of the Major Change Process are as follows:

• [x] File an issue describing the proposal.
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  • Refer to Proposals, Approvals and Stabilization docs for when a second is sufficient, or when a full team FCP is required.
• [ ] Once an MCP is seconded, the Final Comment Period begins.
  • Final Comment Period lasts for 10 days after all outstanding concerns are solved.
  • 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.

You can read more about Major Change Proposals on forge.

[rustbot]

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cc @rust-lang/compiler

[androm3da]

cc @crsabotta