[PATCH, newlib] Allow locking routine to be retargeted

[Freddie Chopin]

On Tue, 2017-01-10 at 16:50 +0000, Thomas Preudhomme wrote:
> Yes absolutely.

Great!

> I didn't progress during holidays for obvious reasons

Yeah, I had so many plans for this period and did almost nothing (;

> but I've 
> implemented the changes you requested and am about to start testing.

You can share the patch earlier if you want/can, I could test some of
the features too (;

Regards,
FCh