Don't include current rustc version string in feature removed help

The version string is difficult to properly normalize out, and removing
it isn't a huge deal (the user can query version info easily through
`rustc --version` or `cargo --version`).

The normalization options were all non-ideal:

- Per-test version string normalization is nasty to maintain, and we
  need to maintain `n` copies of it.
- Centralized compiletest normalization (with a directive opt-out) is
  also not ideal, because `cfg(version(..))` tests can't have those
  accidentally normalized out (and you'd have to remember to opt-out).

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