[RFC] a script to update our gnulib import...

[Alfred M. Szmidt]

   Alfred> I'll look at it this week, and see that for example the gdb/gnulib/
   Alfred> directory doesn't have to be checked in.

   Yeah, it does.

   GDB -- and more generally, the gcc and src trees -- have long had the
   rule that most generated files, especially those required for
   configury -- are checked in, and AM_MAINTAINER_MODE is used in
   configure.

I was a bit unclear, I didn't mean that it shouldn't be checked in as
per what GDB does.  But that it doesn't `have' to be, i.e. that wiping
all generated files and doing ./bootstrap should restore it to working
order.