Add PowerPC 64 target for tests.
As no PowerPC 64 CPU is implemented, this target can just be used to check that
there is no difference between PowerPC 32 & PowerPC 64 used in 32 bits mode.


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2483 c046a42c-6fe2-441c-8c8c-71466251a162
