semver: ignore build metadata

To provide strict total ordering for semver::Version, build metadata must be ignored for equality. Which way is preferred?

Preserve build metadata in Version but equality checking ignores it.
- Most of behaviors are preserved.
Remove build metadata field from Version and the parser ignores it.
- format!("{}", parse("1.0.0+build.1").unwrap()) == "1.0.0"

I we should keep the build data and exclude it from the equality and ordering check. That way we can convert a version back into a string.

@erickt

Auto merge of rust-lang#13789 - feniljain:fix_enum_completion, r=Veykril

Fix rust-lang#12438 false positive regression

Auto merge of rust-lang#12447 - MarcusGrass:mg/fix-12438-regression, …

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