[ccan] CCAN Update for 2015-08

[Rusty Russell]

Hi all!

	A quiet month, but some cleanups occurred: almost none by me :)

Module of the Month: ccan/breakpoint (CC0)
=========================================

	This module supplies breakpoint(), which causes a breakpoint if
you're under a debugger, otherwise does nothing.  It's trivial, and
occasionally useful.

New modules:
============
        pr_log: simple run-time controlled logging interface
                (thanks Cody Schafer)

Minor updates & bugfixes:
========================
	cpuid: various cleanups and fixes (thanks A. Samy)
        talloc/bytestring/list: gcc warning fixes (thanks Cody Schafer)
        bytestring: testcase commentry (thanks David Gibson)
        array_size: fix spurious failure with gcc 5
        
Tools updates:
=============
	configurator: warning fixes and increased correcness
                (thanks Cody Schafer)

Cheers,
Rusty.