pgxnclient: fixup public libexec dir

[gromgit]

Fixes #160937. Note that LIBEXECDIR is an array that already contains the private libexec dir, so this simple change should be sufficient.

@theory, please pull this PR and verify that it solves your issue.

• Have you followed the guidelines for contributing?
• Have you ensured that your commits follow the commit style guide?
• Have you checked that there aren't other open pull requests for the same formula update/change?
• Have you built your formula locally with HOMEBREW_NO_INSTALL_FROM_API=1 brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?
• Is your test running fine brew test <formula>, where <formula> is the name of the formula you're submitting?
• Does your build pass brew audit --strict <formula> (after doing HOMEBREW_NO_INSTALL_FROM_API=1 brew install --build-from-source <formula>)? If this is a new formula, does it pass brew audit --new <formula>?

[p-linnane]

LGTM once @theory confirms. Thanks @gromgit!

[theory]

Hrm, I'm not seeing the libexec updated. I pulled your commit into /opt/homebrew/Library/Taps/homebrew/homebrew-core, uninstalled and reinstalled pgxnclient. Do I need to do something else?

I noticed it was using a bottle, so tried brew install -s pgxnclient but get the same result. I presume there's some other incantation I need to make?

[p-linnane]

For local changes you will need to bypass our API. Try HOMEBREW_NO_INSTALL_FROM_API=1 brew install -sv pgxnclient.

[theory]

Ah, thank you! I now see:

❯ pgxn help --libexec                                       
/opt/homebrew/libexec/pgxnclient

And my libexec-aware installer now puts the app I need in the right place. SHIP IT! 🚀

[p-linnane]

Glad to hear it. Thanks again @gromgit!

[github-actions]

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