autobuild[sn-devel-144]: intermittent test failure detected

The autobuild test system (on sn-devel-144) has detected an intermittent failing test in 
the current master tree.

The autobuild log of the failure is available here:

   http://git.samba.org/autobuild.flakey.sn-devel-144/2017-01-02-2304/flakey.log

The samba build logs are available here:

   http://git.samba.org/autobuild.flakey.sn-devel-144/2017-01-02-2304/samba.stderr
   http://git.samba.org/autobuild.flakey.sn-devel-144/2017-01-02-2304/samba.stdout
  
The top commit at the time of the failure was:

commit 59abfcb7945103cd4031abac86d51cd51ce052ca
Author: Lukas Slebodnik <[email protected]>
Date:   Tue Dec 6 18:07:50 2016 +0100

    WAF: Fix detection of IPv6
    
    Detection of IPv6 failed with strict CFLAGS due to missing
    header file.
    
      Checking for HAVE_IPV6       : not found
    
    ../test.c: In function ‘main’:
    ../test.c:226:34: error: implicit declaration of function
        ‘if_nametoindex’ [-Werror=implicit-function-declaration]
                            int idx = if_nametoindex("iface1");
                                      ^~~~~~~~~~~~~~
    
    Signed-off-by: Lukas Slebodnik <[email protected]>
    Reviewed-by: Andreas Schneider <[email protected]>
    Reviewed-by: Ralph Boehme <[email protected]>
    
    Autobuild-User(master): Ralph Böhme <[email protected]>
    Autobuild-Date(master): Mon Jan  2 18:03:20 CET 2017 on sn-devel-144