"Automate" use of .distfiles a little bit?

[Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>]

This is probably a question for PWS when he returns, but can anyone think
of a reason why, in e.g. the Completion subtree, the .distfiles should not
look like

DISTFILES_SRC='
.disfiles
_*
'

so that explicit names don't need to be added/updated every time completion
functions are added/changed?

I suppose there's an argument that a developer might have work in progress
sitting around that shouldn't accidentally get distributed, but wouldn't
the right solution for that be to always run Util/mkdistree.sh from a
clean clone of the repository?