pulseaudio: Examine gtk3 dependency

[ryandesign (Ryan Carsten Schmidt)]

pulseaudio declares a library dependency on gtk3 (unless the minimal variant is used). Is this really necessary? I see that it is using gtk3 headers at build time, but it does not appear to link to gtk3 libraries. Would a build dependency be sufficient, or does it somehow still use gtk3 files at runtime?

I ask because pulseaudio's gtk3 dependency is the only remaining reason why wine eventually depends on harfbuzz. wine must build universal, and as of version 2, for the moment ​harfbuzz cannot build universal anymore. So at present I cannot update harfbuzz in MacPorts to version 2 without making wine unbuildable. If pulseaudio didn't really require gtk3 libraries at runtime, then pulseaudio could use depends_skip_archcheck-append gtk3 so that gtk3 and its dependencies would not need to be installed universal.

[Ionic (Mihai Moldovan)]

Hmm, as far as I remember, some binaries used GTK3 in the past, like pavumeter. Not sure if these binaries are still built, so yeah, maybe we can drop the gtk3 dependency. I'll have to investigate.

[Ionic (Mihai Moldovan)]

The only thing still using gtk3 within PulseAudio is a gtk-test utility.

I'll make it a build dependency (test wouldn't be appropriate).

[Mihai Moldovan <ionic@…>]

In 4b30d1de62b48b55ea2f89d6fb475e3c2313b50c/macports-ports (master):

audio/pulseaudio: update to 12.2 (no changes), drop gtk3 dependency.

GTK3 is currently only needed for a test program, but we don't even use
the testsuite currently. Can't move to depends_test, though, since the
test program is built with all other artifacts.

Also added some test code, but disabled for now. Adding check as an
unused general build-time dependency sounds like a bad idea.

Fixes: #57643