[libvirt] [PATCH 1/n] modernizing configure

[Eric Blake]

I just built libvirt for the first time today, and noticed that
configure fails on the first missing dependency, rather than trying
harder to make it through and list all missing dependencies at the end.
I ended up restarting configure multiple times.  In the process, I also
noticed that configure is somewhat out of date.

So, what is the oldest version of autoconf and automake that libvirt
will insist on supporting?  For example, is it time to require automake
1.11.1 (the latest stable release) because of its security patch to
avoid potential problems in 'make dist'?  Or is it too soon to expect
all distros to have an automake that new pre-installed, and more effort
be put into supporting automake 1.9.6 and autoconf 2.59 (those being the
implicit minimum requirements due to the use of gnulib)?  Or somewhere
in between?

Meanwhile, how about this patch, for me getting my feet wet in helping
to modernize the autotools usage, and hopefully leading up to future
patches to make configure list all missing dependencies at once, rather
than requiring multiple restarts.

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