Fix in-src-tree builds by making gdbserver/gnulib/ a separate library (a la libiberty, etc.), and adding ACX_CONFIGURE_DIR.

[Tom Tromey]

>>>>> "Stan" == Stan Shebs <stanshebs@earthlink.net> writes:

Joel> Perhaps we'll just want to fork away from top-level src, and have
Joel> our own independent src (which, btw, would pave the way for a switch
Joel> to a better VCS). It raises the problem of the synchronization
Joel> with binutils, of course, but other than that, do we really need
Joel> to have the same src as all the other projects? Do we really benefit
Joel> from that?

Stan> It *is* beneficial to get BFD checkins automatically.  However, I
Stan> think we'd be OK with a daily pull from a binutils repo, it's not
Stan> often that a GDB change is revlocked to a BFD version.  (And of course
Stan> by "BFD" I also mean opcodes etc as well :-) )

I think Joseph Myers' migration plan is still the gold standard.

In that one we would keep gdb and binutils in the same repository,
recognizing that the projects share a lot of code.

Tom