[CFT] Mesa 19.0.0 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 major 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 or drm-legacy-kmod for regressions? If you find any confirm
previous version(s) aren't affected then attach pciconf -lv output, Xorg.0.log,
and LIBGL_DEBUG=verbose output.

Note, Vulkan on Intel requires drm-kmod and IvyBridge or newer and maybe
a bit unstable on drm-fbsd11.2-kmod (i.e., 4.11.*).
Note2, ignore patch rejects if .rej files only contains changes to PORTREVISION.

# Apply
$ fetch -qo /tmp/libdrm-2.4.97.diff 'https://bugs.freebsd.org/bugzilla/attachment.cgi?id=201643'
$ fetch -qo /tmp/mesa-llvm7.diff 'https://bugs.freebsd.org/bugzilla/attachment.cgi?id=199665'
$ fetch -qo /tmp/mesa-18.3.diff 'https://reviews.freebsd.org/D19099?download=true'
$ fetch -qo /tmp/mesa-19.0.diff 'https://reviews.freebsd.org/D19100?download=true'
$ patch -Efsp1 -i /tmp/libdrm-2.4.97.diff -d /usr/ports
$ patch -Efsp1 -i /tmp/mesa-llvm7.diff -d /usr/ports
$ patch -Efsp0 -i /tmp/mesa-18.3.diff -d /usr/ports
$ patch -Efsp0 -i /tmp/mesa-19.0.diff -d /usr/ports
$ make all deinstall install clean -C /usr/ports/graphics/libdrm
$ 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-19.0.diff -d /usr/ports
$ patch -REfsp0 -i /tmp/mesa-18.3.diff -d /usr/ports
$ patch -REfsp1 -i /tmp/mesa-llvm7.diff -d /usr/ports
$ patch -REfsp1 -i /tmp/libdrm-2.4.97.diff -d /usr/ports
$ make all deinstall install clean -C /usr/ports/graphics/mesa-dri
$ make all deinstall install clean -C /usr/ports/graphics/mesa-libs
$ make all deinstall install clean -C /usr/ports/graphics/libdrm

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