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