The group no longer exists, but these packages were never rebuilt
since then.
While at it also remove the texinfo install scripts
which are handled by a hook now and no longer needed.
And fix a typo in the flex license install line
In some cases this will introduce cycles which could likely be cleaned
up by only depending on some unix tools instead of the whole autotools.
Rebuilding doesn't make much sense at this point since it just adds a subset
of base-devel which is still installed by default.
