* master:
  3rdparty/ccan: Update for build fix wrt recent gcc/binutils

We need the following patch of mine:

   http://git.ozlabs.org/?p=ccan;a=commitdiff;h=b97c7f0841f5173a07a2571f2c99f944d8405a90

Else in case of two files used simultaneously the index is messed up.
Fixes test_wcfs_watch_2files and now all wcfs tests pass again.

Reason: see comments.
Prerequisite to fix test_wcfs_watch_2files