php: use brewed gd & pcre2, reorganise dependencies

[Bo98]

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• Use brewed gd and pcre2 over bundled versions.
  • This should fix issues on Apple Silicon that we have already fixed in the pcre2 formula.
  • Using brewed gd means that freetype, jpeg, libpng and webp are no longer direct dependencies (but are dependencies of gd).
• Make krb5 dependency explicit (was pulled by libpq and implicitly linked instead of the system version).
• Clean-up unneeded libedit flags which have been solved by the addition of libedit.pc to Homebrew/brew.

[SeekingMeaning]

DNM?

[SMillerDev]

Please apply this to the versioned formula as well then.

[Bo98]

PHP 7.2 and 7.3 is less trivial and require backporting some patches. I'll have a look.

DNM?

While it would be nice to see if this fixes things on Apple Silicon, I ultimately would still be merging this PR anyway since we should prefer brewed libraries over bundled ones.

[SMillerDev]

PHP 7.2 and 7.3 is less trivial and require backporting some patches. I'll have a look.

If it's not doable we can just skip it. Just wanted to make sure it was considered

[mistydemeo]

Confirmed this fixes PHP on Apple Silicon.

[BrewTestBot]

🤖 A scheduled task has triggered a merge.