[Bug 233034] graphics/mesa-dri: update to 18.3.0

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233034

--- Comment #4 from Jan Beich <[email protected]> ---
(In reply to Warner Losh from comment #3)
> Since 12.0 isn't out, it's easier to manage things if we wait to commit this.

Mesa upstream appears to release new minor version every ~3 months. If 18.3.*
doesn't land in ports early 2019Q1 its QA is likely to intersect with 18.4.0
(or 19.0.0). Part of QA is whatching bugzilla/lists/etc for regressions after
landing, reported by users experienced enough to switch to /latest. Besides,
doing updates in small/incremental steps is easier than waiting then skipping
over versions which increases the risk and complicates regression tracking.

> make sure we don't break amdgpus

Similar to Intel, depends on the kernel driver: radeonkms (legacy) is probably
under the most risk. Otherwise, see
https://lists.freebsd.org/pipermail/freebsd-x11/2018-December/022256.html

> it works well with the latest drm-kmod modules

drm-stable-kmod is probably more important:
- selected by drm-kmod for 11.2 or /stable/11
- working SNA on xf86-video-intel[1]
- working Vulkan on AMD[2] and partially working on Intel[3]

[1] UXA (default due to legacy DRM) is slow while modesetting(4x) incurs
flickering/stutter when switching workspaces back and forth here
[2] https://github.com/FreeBSDDesktop/kms-drm/issues/33
[3]
https://github.com/FreeBSDDesktop/DEPRECATED-freebsd-base-graphics/issues/132
    https://bugs.freebsd.org/bugzilla/attachment.cgi?id=187401

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