x11-drivers/xf86-video-qxl: upgrade to 0.1.6

- 4 patches are in the source now (checked manually)
- made portlint, portclippy & portfmt happy
- poudriere stage-qa: ok
- compiles on aarch64
- maintainer timeout on review

changelog: https://lists.x.org/archives/xorg-announce/2023-January/003316.html

Differential Revision: https://reviews.freebsd.org/D38612