Mesa usually uses the timestamps of the llvm and driver shared libraries
as a cache key.  In /nix/store these are all zero, so we'll include
$(drivers) in the cache key, which should be unique for all combinations
of mesa and llvm versions.

Semi-automatic update generated by https://github.com/ryantm/nixpkgs-update tools. This update was made based on information from https://repology.org/metapackage/dbus/versions.

Semi-automatic update generated by https://github.com/ryantm/nixpkgs-update tools. This update was made based on information from https://repology.org/metapackage/libdrm/versions.

The libtiff change brings security fixes, and the mesa change should be
fixing a rather painful problem for some GPUs, and the rebuilds only
just started.