Support ppc64le and fix cross architecture bootstrapping
This pull request adds support for ppc64le in pmbootstrap and fixes bootstrapping of a new architecture. The generated cross-compiler still needs the same fixups as pmaports@ad9a7874, but works fine and the QEMU target can be built successfully and booted (pending pmaports pull request with necessary changes, will open after this gets merged).
Edited by Jens Reidel