[Octave-bug-tracker] [bug #57044] Use gnulib without hg subrepo and `bootstrap` with proper revision control

[Mike Miller]

Follow-up Comment #20, bug #57044 (project octave):

Isn't adding this check into configure a bit of overkill?

When we track gnulib as a hg subrepository, it's true that using "hg update"
will automatically switch to the correct revision. However, the user who is
bisecting or tracking development still always needs to use bootstrap in order
to copy those changes from "gnulib" into "libgnu". Otherwise, they definitely
may be building with out of date copies of source files in libgnu.

Adding this check into configure is a step above and beyond what we had been
doing before, but it does check for something that would normally have been
enforced by hg. However, it's still no guarantee that the user has run
bootstrap to copy the sources from gnulib into libgnu. I'm not sure it's
useful.

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