add mesa-dri-drivers to meta RPM

[alaniwi]

Needed to silence warnings with snap related to looking for swrast_dri.so

I'd already installed it on sci2-test, so I think there was something else that it was potentially similarly useful for.

Doesn't involve many dependencies:

Installing:
 mesa-dri-drivers                        x86_64                        18.3.4-12.el7_9                        updates                        7.2 M
Installing for dependencies:
 llvm-private                            x86_64                        7.0.1-1.el7                            base                            23 M
 mesa-filesystem                         x86_64                        18.3.4-12.el7_9                        updates                         19 k

[alaniwi]

added ready to deploy