remove Rust "gecko" features from nss. [ci full]

[mhammond]

It's not actually enabled for desktop, so just adds confusion. It appears as though it was previously needed before lib_sqlite3 grew its own set of features to control how sqlite is linked.

(I'm fairly sure this isn't going to break desktop, but headsup @rvandermeulen @DonalMe @dsmithpadilla - if the m-c bump does end up failing for nss/sqlite looking reasons, this will be the reason!)

Pull Request checklist

• Breaking changes: This PR follows our breaking change policy
  • This PR follows the breaking change policy:
    • This PR has no breaking API changes, or
    • There are corresponding PRs for our consumer applications that resolve the breaking changes and have been approved
• Quality: This PR builds and tests run cleanly
  • Note:
    • For changes that need extra cross-platform testing, consider adding [ci full] to the PR title.
    • If this pull request includes a breaking change, consider cutting a new release after merging.
• Tests: This PR includes thorough tests or an explanation of why it does not
• Changelog: This PR includes a changelog entry in CHANGELOG.md or an explanation of why it does not need one
  • Any breaking changes to Swift or Kotlin binding APIs are noted explicitly
• Dependencies: This PR follows our dependency management guidelines
  • Any new dependencies are accompanied by a summary of the due diligence applied in selecting them.

[mhammond]

/taskcluster ci full