maintainer-feedback requested: [Bug 256078] textproc/libxml2: Update to 2.9.12 - WIP

Bugzilla Automation <bugzilla@FreeBSD.org> has asked freebsd-desktop (Team)
<desktop@FreeBSD.org> for maintainer-feedback:
Bug 256078: textproc/libxml2: Update to 2.9.12 - WIP
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256078



--- Description ---
Hi,

I've been hacking on libxml2 a bit including converting it to CMake and would
like some input, there are some differences between current version and the new
version that I'm not sure about on how to handle.

./work/stage/usr/local/lib/xml2Conf.sh
 -- CMAKE --
prefix is expanded
XML2_LIBS="-lxml2 -lz -llzma -pthread	-lm"

 -- Autotools --
XML2_LIBS="-lxml2 -lz  -L/usr/lib -llzma  -L/usr/lib  -lm"


./work/stage/usr/local/libdata/pkgconfig/libxml-2.0.pc
 -- CMAKE --
Libs.private:  -pthread -lz -llzma  -lm

 -- Autotools --
Libs.private:  -lz  -L/usr/lib -llzma -L/usr/lib -lm


Questions:
Is -L/usr/lib needed? From what I can tell CMake doesn't have a variable for
this, suggestions are welcome. In worst case we can hardcode it.

Current version in ports forces -DPIC cflag, is this needed?
https://cgit.freebsd.org/ports/tree/textproc/libxml2/files/patch-Makefile.in

make test passes on 13-STABLE (amd64)

Motivation for moving to CMake is mainly because it's faster and much easier to
debug, I do plan to upstream as many changes as possible but perhaps it's
futile effort?

I'm not sure how to handle py-libxml2 in a sane way. :/

Note for users:
https://gitlab.gnome.org/GNOME/libxslt/-/issues/51
https://git.alpinelinux.org/aports/diff/main/libxslt/APKBUILD?id=3ec3aafa689b13
4df3f999baf8841099c6e8c422

Changes for 2.9.12
https://gitlab.gnome.org/GNOME/libxml2/-/commit/b48e77cf4f6fa0792c5f4b639707a2b
0675e461b

Thanks in advance,
Daniel