There's a merged pull request on the void-packages repository

gc: Update to 8.2.2
https://github.com/void-linux/void-packages/pull/39014

Description:
Other cleanups:
* Remove --enable-mmap (which is the default configure option now)
* No longer depends on libatomic_ops (provided the compiler is gcc or clang)
* Fix license (it is MIT, not GPL)
* Remove unneeded CFLAGS
* Set maintainer

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#### Testing the changes
- I tested the changes in this PR: **briefly**

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#### Local build testing
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