unix: add IoctlLoopConfigure on linux

[alex-matei]

LOOP_CONFIGURE ioctl is used to setup and configure all loop device
parameters in a single step.
Add to the unix package a new function that exposes LOOP_CONFIGURE.

Fixes golang/go#63962

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Patch Set 2:

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Patch Set 2:

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Message from Alexandru Matei:

Patch Set 4:

(2 comments)

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Patch Set 4: Auto-Submit+1 Code-Review+2 Commit-Queue+1 Run-TryBot+1

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Patch Set 4:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2023-11-12T20:43:44Z","revision":"7520d4adba835e3745a8515ff3a3832b98d7d922"}

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Patch Set 4: -Commit-Queue

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Patch Set 4: LUCI-TryBot-Result+1

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Patch Set 4: Code-Review+1

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This PR is being closed because golang.org/cl/540075 has been merged.