[OE-core] SDK extract errors on master

[Jack Mitchell]

Built an SDK today on 7eb0abc5f4d971d9a511c93cfb2eb52b72e6f228 and when 
I tried to install it I got the following error:

Setting it up...ls: cannot access 
/home/jack/Work/build/openembedded/sdk/1/x86_64/environment-setup-*: No 
such file or directory

I have been messing about with the SDK install path and at one point it 
did spew out a load of files installed vs shipped warnings I assume due 
to a change of path and it getting upset about it, but since then I 
deleted the tmp directory and rebuilt a new SDK without warnings. 
However, both acted in the same way.

The SDK then sits without installing, seemingly stuck on: grep 
OECORE_NATIVE_SYSROOT, which I assume means it's looking for the 
(non-existant) environment file.

Any clues? Is this broken for anyone else?

Cheers,
Jack.