Allow make test with ASan / --address-sanitizer

[William Brown]

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).

It's what you have to do because of python being in the way. It's fine
... 

>  
> 
> Once we get a more modern sn-devel I'll enable this by default in
> autobuild. 
> 
> Please review and push!
> 
> Andrew Bartlett

Looks good to me, I can't wait to use this more seriously!

Thanks for this,

William