[PATCH v2 00/16] use gnulib more heavily

[Tom Tromey]

This is a refresh of my earlier series:

    https://sourceware.org/ml/gdb-patches/2012-11/msg00420.html

In this version I believe I've addressed all the review comments made
for the earlier version.

The earlier series was derailed by the "errno" module; but later on
Joel said it was ok to push ahead, and so that is what I am doing.

Built and regtested on x86-64 Fedora 18, and also built using the
Fedora->mingw cross compiler.

This series is now based on my "common.m4" series from yesterday.

Tom