Ask from binding if GC is disabled (backport #126) (#129)

This is an automatic backport of pull request #126 done by
[Mergify](https://mergify.com).
Cherry-pick of eac7e88 has failed:
```
On branch mergify/bp/v1.9.2+RAI/pr-126
Your branch is up to date with 'origin/v1.9.2+RAI'.

You are currently cherry-picking commit eac7e88.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   mmtk/Cargo.lock
	both modified:   mmtk/Cargo.toml
	both modified:   mmtk/src/collection.rs

no changes added to commit (use "git add" and/or "git commit -a")
```


To fix up this pull request, you can check it out locally. See
documentation:
https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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---------

Co-authored-by: Eduardo Souza <[email protected]>

Author: mergify[bot]