switch-arch: Prepare ppc64 support
Detect ppc64 as Big Endian and 64-bit.
Reuse arch/ppc/ wherever possible.
v3:
* Split off int128_t fix.
* Rebase to HEAD, add support for qemu-ppc64 target.
* Rename $INCLUDEARCH to $BASEARCH and initialize it earlier.
* Set both CONFIG_$BASEARCH and CONFIG_$ARCH if they differ.
* Use -fno-builtin.
* Add ppc64 config, copied from ppc.
v2:
* Use powerpc64 prefix.
* Disable fake int128_t for everything but sparc64.
Signed-off-by: Andreas Färber <andreas.faerber@web.de>
git-svn-id: svn://openbios.org/openbios/trunk/openbios-devel@927 f158a5a8-5612-0410-a976-696ce0be7e32