Add SO_PREFER_BUSY_POLL and SO_BUSY_POLL_BUDGET

[tammela]

Remove the comment of these socket options.
Reference: https://elixir.bootlin.com/linux/latest/source/include/uapi/asm-generic/socket.h

[rustbot]

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[tammela]

From the CI results (i686-unknown-linux-musl) it seems like the machine does not have a uapi header with the constant.
They were added in 5.11 and the sanitized headers are in 4.19: https://github.com/rust-lang/libc/blob/main/ci/install-musl.sh#L68

[devnexen]

for the time being, need to add those constants as exception (for CI), as if musl then ignore those two.

[tammela]

@devnexen Got it. I was wondering if someone tried to update the kernel headers for the musl CI.
Alpine uses musl as well and they don't seem to use sabotage-linux headers but rather roll their own (currently targeting 6.6 soon to be 6.10):
https://git.alpinelinux.org/aports/tree/main/linux-headers?h=master

[tammela]

I updated the CI to use the alpine headers here: tammela@17af7ba

Seems to be passing the CI scripts, let me know if it's worth the shot and I can open up a PR

[devnexen]

nice, it might be best to create a PR for this musl update alone tough. cc @tgross35

[tgross35]

Huh, no clue why those were commented out but looks like it has been that way since #2135. Anyway lgtm, thanks for including the link.

[tammela]

Needs this one to pass CI: #3921