Allow make test with ASan / --address-sanitizer

[Andrew Bartlett]

On Thu, 2018-05-03 at 16:35 +1200, Andrew Bartlett via samba-technical
wrote:
> I needed to get AddressSanitizer working to fix the LSA use-after-free
> bug and the attached make it all work again.
> 
> Recent versions of GCC require that the library be in LD_PRELOAD before
> anything that is linked with libasan.  I use a horrible ldd hack to
> find the right library path (sorry, not sorry). 
> 
> Once we get a more modern sn-devel I'll enable this by default in
> autobuild. 

And this patch allows a developer build with --address-sanitizer
enabled. 

Please review this also.

Thanks!

Andrew Bartlett
-- 
Andrew Bartlett                       http://samba.org/~abartlet/
Authentication Developer, Samba Team  http://samba.org
Samba Developer, Catalyst IT          http://catalyst.net.nz/services/samba
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