[PATCH modular 2/3 (v2)] jhbuildrc: Support skipping packages on a per-architecture basis.

[Jesse Adkins]

> +             'xf86-video-impact', # not on non-MIPS (#26342)
Not exactly. #26342 resulted from impact always trying to pull a file
that doesn't exist after driver video abi version 6 (or something
similar to that).

On a side note : Are you actually able to build this driver from the
current git? If not, it's probably best to move impact to unmaintained
drivers as well. At this point I'm guessing that Impact hasn't been
building for a long time, and it doesn't seem to have a maintainer.