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

New package: linux5.11-5.11.1.
https://github.com/void-linux/void-packages/pull/29056

Description:
Switch to using 5.11 tarball + minor version patch. Allows the tarball
to be shared across updates.

TODO:
- poison patch <-- `mm/page_poison.c` has changed a lot, no idea if this is still necessary. @q66
- ppcle patch <-- `ppcle-broken-vdso.patch` and `ppcle-ll-compat-sys.patch` appear to not be upstream, but didn't apply cleanly. I assume they are still necessary?

<!-- Mark items with [x] where applicable -->

#### General
- [ ] This is a new package and it conforms to the [quality requirements](https://github.com/void-linux/void-packages/blob/master/Manual.md#quality-requirements)

#### Have the results of the proposed changes been tested?
- [x] I use the packages affected by the proposed changes on a regular basis and confirm this PR works for me
- [ ] I generally don't use the affected packages but briefly tested this PR

<!--
If GitHub CI cannot be used to validate the build result (for example, if the
build is likely to take several hours), make sure to
[skip CI](https://github.com/void-linux/void-packages/blob/master/CONTRIBUTING.md#continuous-integration).
When skipping CI, uncomment and fill out the following section.
Note: for builds that are likely to complete in less than 2 hours, it is not
acceptable to skip CI.
-->

#### Does it build and run successfully? 
(Please choose at least one native build and, if supported, at least one cross build. More are better.)
- [x] I built this PR locally for my native architecture, (x86_64)
- [x] I built this PR locally for these architectures (if supported. mark crossbuilds):
  - [x] aarch64-musl
  - [ ] armv7l
  - [ ] armv6l-musl

[ci skip]