[OE-core] build failures due to pigz host tool

[Richard Purdie]

On Sat, 2019-07-06 at 09:14 +0100, Richard Purdie wrote:
> I can't see anything obvious wrong with the way job->calc is being
> handled.
> 
> I get the feeling this doesn't happen when uninative is in use which
> suggests its something odd going on with libpthread on opensuse but
> its hard to know that for sure.

https://github.com/madler/pigz/issues/68

Others are seeing this outside of OE and it seems specific to suse,
probably to its pthread version/patches.

Cheers,

Richard