Allow caller to block signals.

Greetings,

Here is the second part, actually implementing the configure option.

Thanks,
--
Paul Pluzhnikov

commit cf823ed0d4d2447aa91af0e3cb5fbb6a6cba5068
Author: Paul Pluzhnikov <ppluzhnikov@google.com>
Date:   Mon Sep 21 11:37:38 2009 -0700

    New configure option to allow caller to block signals.
2 files changed