- Update to 18.3.4
* A fix in the XvMC state-tracker, which was causing some video attributes to
not take affect. On the video front the VAAPI state tracker has seen
improvements with VP9 streams while the amdgpu driver advertises all available
profiles.
* On Intel side we have compiler fixes and extra PCI IDs for Coffee Lake and
Ice Lake parts. In the Broadcom drivers a couple of memory leaks were
addressed and the NEON assembly should compile properly on armhf.
* Other drivers such as radeonsi, nouveau and freedreno have also seen some
love. The RADV driver has seen addressed to compile correctly with GCC9
amongst other changes.
* The Xlib based libGL have been addressed to work with X servers, which lacks
the MIT-SHM extension such as XMing.
* To top it up we have a few fixes to the meson build system.

- Update to 18.3.3
* In this release we have:
A memory leak fix in the etnaviv driver, better NEON assembly code in vc4 and
couple of stability improvements to the radeonsi driver. Another memory leak
affecting all gallium drivers have also been addressed.
* The time required to compile GLSL shaders with large amount of uniforms, such
as Godot, has been improved.
* GLX and swrast have also seen some improvements.
* On the Vulkan side, the ANV driver adjusted the number of images supported
for gen8 and earlier to 8, while for newer hardware it remains the same 64.
The RADV driver has seens a collection of stability improvements and fix for
the Vulkan version advertised in some corner cases.
* To top it all up, the meson build system has seen a steady amount of fixes:
the DSO version for the VDPAU drivers is now included, ICC compatibility
patches, opencl handling and relaxed handling when building osmesa.

- adjusted n_Disable-Xshm-for-now-since-it-results-in-render-erro.patch

- Build Mesa with meson instead of automake
+ Build classic swrast with Mesa, as its a dependency for osmesa - delete it
while installing
+ Build egl with Mesa-drivers as it demands one windowing-system -
delete it while installing