[RFC 0/2] Let's discuss moving gdbserver to top-level

[Tom Tromey <tom@tromey.com>]

I've wanted to move gdbserver to the top-level for a while now.  I
think it will provide a decent benefit, mainly by letting gdb and
gdbserver share their libiberty, gnulib, and "common" libraries --
shaving off some build time.  It also will have the nice side effect
of simplifying gdbserver's Makefile, fixing some existing bugs.

I have written the patches to do this, but before reworking them into
submittable form, I thought I'd send a couple of initial patches and
start a discussion.

This short series removes a couple of barriers to turning "common"
into a library.  These are pretty much the only changes that could be
sent in isolation.

The rest of the series is:

* Move gnulib to the top-level
* Rename "common" to "gdbsupport" in preparation for a move
* Move "gdbsupport" to top-level
* Move gdbserver to top-level
* Make gdbserver share the other top-level libraries

Most of the patches are pretty mechanical.  There are one or two
hacks, primarily because this series doesn't move the "nat" directory.

Let me know what you think.

Tom