Try each pkg-config query separatedly (backport #9134)

[mergify]

This is an automatic backport of pull request #9134 done by Mergify.
Cherry-pick of 3afd3a3 has failed:

On branch mergify/bp/3.10/pr-9134
Your branch is up to date with 'origin/3.10'.

You are currently cherry-picking commit 3afd3a392.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	new file:   changelog.d/pkgconfig-once

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   cabal-install-solver/src/Distribution/Solver/Types/PkgConfigDb.hs

Cherry-pick of 9f15045 has failed:

On branch mergify/bp/3.10/pr-9134
Your branch is ahead of 'origin/3.10' by 1 commit.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit 9f1504590.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	new file:   changelog.d/pkgconfig-envvars

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   Cabal/src/Distribution/Simple/Program/Builtin.hs

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

---

Mergify commands and options

More conditions and actions can be found in the documentation.

You can also trigger Mergify actions by commenting on this pull request:

• @Mergifyio refresh will re-evaluate the rules
• @Mergifyio rebase will rebase this PR on its base branch
• @Mergifyio update will merge the base branch into this PR
• @Mergifyio backport <destination> will backport this PR on <destination> branch

Additionally, on Mergify dashboard you can:

• look at your merge queues
• generate the Mergify configuration with the config editor.

Finally, you can contact us on https://mergify.com

[jasagredo]

The changes in PkgConfigDb.hs were already included with #9520. This PR should have been backported before that one, but in this situation, this is the remaining change from the backportee PR that is not yet backported.

[Mikolaj]

Got it. Let me set the label.