maintainer-feedback requested: [Bug 266599] graphics/png: Update to 1.6.38

From: <bugzilla-noreply_at_freebsd.org>
Date: Sun, 25 Sep 2022 13:29:54 UTC
Bugzilla Automation <bugzilla@FreeBSD.org> has asked freebsd-desktop (Team)
<desktop@FreeBSD.org> for maintainer-feedback:
Bug 266599: graphics/png: Update to 1.6.38
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=266599



--- Description ---
- Switch to CMake
- Switch apng repo to https://sourceforge.net/projects/libpng-apng/ (same as
Gentoo uses)

Compile and runtime tested on FreeBSD 13.1-STABLE (amd64) (make, make
check-plist, make test)
Compile and runtime tested on FreeBSD FreeBSD 13.1-RELEASE-p1 (arm64) (make,
make check-plist, make test)

Poudriere testport OK 12.3-RELEASE (amd64)
Poudriere testport OK 13.1-RELEASE (i386)

Changelog: https://github.com/glennrp/libpng/blob/v1.6.38/CHANGES

Reference:
https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=437a2672807d5af06d7c6185db
20e3f318570f65