- Update to bugfix release 23.1.2

- needed to fix build of Mesa 23.1
* Mesa-drivers: -Dshader-cache=enabled
* Mesa: -Dxlib-lease=enabled
* recommended for both Mesa and Mesa-drivers to avoid some scary messages when
comparing fds: -Dallow-kcmp=enabled
- Credits for figuring this out go to "llyyr"
- gbm files are no longer needed to be removed manually for -drivers build
- VDPAU support for r300 has been dropped with Mesa 23.1
- supersedes n_no-sse2-on-ix86-except-for-intel-drivers.patch

- Update to bugfix release 23.1.1
- adjusted u_dep_xcb.patch

- Update to 23.1.0
* new feature release
* some highlights
+ Our OpenCL implementation Rusticl added support for AMD GPUs.
+ Both ANV (Intel) and RADV (AMD) got initial support for Vulkan Video
decoding.
+ Vulkan Graphics Pipeline Libraries (GPL) are now supported in RADV.
- adjusted n_stop-iris-flicker.patch
- supersedes U_ReturnME.patch
- meson option "-Ddri-drivers" has been removed; wasn't used any
longer by us --> killed it