[CFT] Mesa 18.3.0 update (mesa-libs, mesa-dri, libosmesa, clover)

Mesa provides OpenGL/Vulkan drivers for Intel/AMD cards and also VAAPI/VDPAU
drivers for AMD cards. Recently, a new minor version was released. So far it
was only tested Skylake with drm-stable-kmod on 13.0-CURRENT. Can someone test
on FreeBSD 11.2 for regressions? If you find any confirm previous version(s)
aren't affected then attach /var/log/Xorg.0.log and LIBGL_DEBUG=verbose output.

# Apply
$ fetch -qo /tmp/mesa-18.2.diff 'https://reviews.freebsd.org/D16571?download=true'
$ fetch -qo /tmp/mesa-18.3.diff 'https://reviews.freebsd.org/D17872?download=true'
$ patch -Efsp0 -i /tmp/mesa-18.2.diff -d /usr/ports
$ patch -Efsp0 -i /tmp/mesa-18.3.diff -d /usr/ports
$ make all deinstall install clean -C /usr/ports/graphics/mesa-libs
$ make all deinstall install clean -C /usr/ports/graphics/mesa-dri

# Undo
$ patch -REfsp0 -i /tmp/mesa-18.3.diff -d /usr/ports
$ patch -REfsp0 -i /tmp/mesa-18.2.diff -d /usr/ports
$ make all deinstall install clean -C /usr/ports/graphics/mesa-libs
$ make all deinstall install clean -C /usr/ports/graphics/mesa-dri

# Testing examples
- graphics/mesa-demos: glxgears, eglgears_x11
- multimedia/mpv: --hwdec=auto (VAAPI/VDPAU EGL interop)
- www/firefox: MOZ_ACCELERATED=1 MOZ_WEBRENDER=1 (GPU compositing)
- https://forums.freebsd.org/threads/unreal-engine-4.65300/
- devel/vulkan-tools: vulkaninfo
- games/vkquake or emulators/{ppsspp,rpcs3} with Vulkan renderer
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