Install gnu-config config.{guess,sub}
Sometimes, apps bundle old versions of modules which were released before a certain architecture they want to build on.
Very often, using the gnu-config's config.guess and/or config.sub is enough to get the module to build on the newer arch.
Adding gnu-config to bootstrap will make it end up in the Sdk.
This was already done in org.freedesktop.Sdk//1.6 for the same reasons (it is in Yocto).
Fixes #280 (closed)
Edited by Mathieu Bridon