[Bug 2081848] Re: fix underlinking with recent LLVM 18.1.8 backport

[Chris Halse Rogers]

Ok. It looks like what has happened here is:
* An update of llvm-toolchain-18 was uploaded to noble-proposed - version 1:18.1.8-9ubuntu1~24.04 
 + Part of the new llvm-toolchain-18 update was adding the missing libLLVM-18.so.18.1 link. This is a correct fix to llvm-toolchain-18, but I think should have also included a change to the solib metadata to indicate that builds against this package have a strict version dependency.
* As a part of testing that update, it was discovered that bpftrace failed against the new llvm18
* This update was prepared for bpftrace, to fix building against the new llvm18
 + Due to building against the llvm-toolchain-18 in -proposed, this picked up a dependency on libLLVM-18.so.18.1.
* The build-time tests of bpftrace pass fine, because at build time the necessary version of libllvm18 is installed.
* Because the solib metadata of llvm-toolchain-18 was not updated, the bpftrace package does *not* have a versioned dependency on libllvm18 >= 1:18.1.8-9ubuntu1~24.04
 + This would have changed this failure from "bpftrace is broken" to "bpftrace won't update/can't be installed", which is not *great* but is better.

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https://bugs.launchpad.net/bugs/2081848

Title:
  fix underlinking with recent LLVM 18.1.8 backport

Status in bpftrace package in Ubuntu:
  Confirmed
Status in bpftrace source package in Noble:
  Fix Released

Bug description:
  An archive test rebuild with a planned LLVM 18.1.8 showed up one regression, building bpfrace.  The issue however is in bpftrace itself, and is already fixed in oracular 0.21.0-1ubuntu1.
  Another backport is from 0.21.0-1ubuntu5, ignoring the unknown .debug_addr section in dh_dwz on armhf.

  Testing done for that patch: The package builds with the backported
  18.1.8 package and passes its tests.

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