[libvirt] [libvirt-glib] Use latest warnings.m4 from gnulib

[Daniel P. Berrange]

On Thu, Sep 26, 2013 at 04:31:27PM +0200, Christophe Fergeau wrote:
> The one we were using does not work properly with clang, causing
> the build process to try to use -f/-W options that are not
> supported by clang.
> ---
>  m4/warnings.m4 | 82 ++++++++++++++++++++++++++++++++++++++++++++--------------
>  1 file changed, 62 insertions(+), 20 deletions(-)

ACK,

Also ack to same change in libosinfo which undoubtly needs the
same update.

Daniel
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