- U_intel-Add-more-Coffee-Lake-PCI-IDs.patch
* Add more Coffeelake PCI IDs (request by Intel)

- Update to 17.3.2
* Multiple fixes in the RADV Vulkan driver, workaround when using
slibtool and a GLSL workaround for various titles using Unreal
Engine 4.
- Drop upstreamed u_r600-Add-support-for-B5G5R5A1.patch
- Modify u_mesa-python3-only.patch to not break python 2.

- Update to 17.3.1
* Multiple fixes and improvements of the GLSL shader cache. The
RADV driver no longer advertises VK_EXT_debug_report - there is
no support for it.
* The i965, radeonsi, nvc0 and freedreno drivers have received a
few small fixes each.
* A number of big endian fixes have been merged.

- Switch to python3 during build instead of python2
* Add patch u_mesa-python3-only.patch

- Add Mesa-dri and Mesa-gallium to baselibs.conf.
- Require llvm >= 3.9.0
* The build fails otherwise because it is required for multiple
Mesa components.

- Drop some redundant wording from descriptions.
Drop redundant %if guard around a %post section.

- Use different form of split for faster build (bnc#1071297)