There is an updated pull request by Nopey against master on the void-packages repository

https://github.com/Nopey/void-packages rr-update
https://github.com/void-linux/void-packages/pull/49015

rr: update to 5.7.0.
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#### Testing the changes
- I tested the changes in this PR: **YES**

linux-6.patch is no longer needed, as it has been merged upstream.

an update-check script has been added for rr, it checks for their latest GitHub release

#### Local build testing
- I built this PR locally for my native architecture, x86_64-glibc
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- I built this PR locally for these architectures (if supported. mark crossbuilds):
  - aarch64-musl (CROSS)
  - armv7l (CROSS)
  - armv6l-musl (CROSS)
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A patch file from https://github.com/void-linux/void-packages/pull/49015.patch is attached