textproc/xorg-sgml-doctools: Update to 1.12.1
Update COMMENT and WWW.
Add LICENSE.
Since this port is arch independent, install .pc file to share/pkgconfig.
https://lists.x.org/archives/xorg-announce/2024-April/003502.html
PR: 287578
Approved by: x11 (arrowd)
Approved by: osa (mentor)