pkg/59248: graphics/libheif doesn't actually use dav1d

[dholland%NetBSD.org@localhost]

>Number:         59248
>Category:       pkg
>Synopsis:       graphics/libheif doesn't actually use dav1d
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Apr 02 22:40:00 +0000 2025
>Originator:     David A. Holland
>Release:        NetBSD 10.99.10 (pkgsrc 20250402 22:30Z)
>Organization:
au marais de cmake
>Environment:
System: NetBSD valkyrie 10.99.10 NetBSD 10.99.10 (VALKYRIE2) #0: Mon Feb 19 02:27:48 EST 2024  dholland@valkyrie:/y/objects/usrobj/sys/arch/amd64/compile/VALKYRIE2 amd64
Architecture: x86_64
Machine: amd64
>Description:

The fuffle today with libheif exposed a problem, which is that while
it depends on dav1d, it doesn't actually build dav1d support.

It appears to configure dav1d support as a plugin, but then doesn't
install (or, I think, build) any plugins.

>How-To-Repeat:

% make configure
observe:
   Dav1d AV1 decoder               : - disabled

Digging then suggests that it's configured as a plugin, but no plugins
happen.

>Fix:

Dunno, sorry. Maybe set it to configure as a builtin?

(or maybe just drop the dav1d dep, no idea if it matters)