[OE-core] [PATCH] rpm: run binary package generation via thread pools

[Alexander Kanavin]

On 06/12/2017 05:58 PM, Alexander Kanavin wrote:
> This greatly reduces build times when there is a large amount of small
> rpm packages to produce. The patches are rather invasive,
> and so will be submitted upstream.

The changes in this version of the patch:

- fixed (hopefully) the segfaults seen on autobuilder with older 
versions of gcc

- made sure that build host and build time are set only once, and are 
the same in all output files.

Alex