Revert "runqemu.in: qemu-system-ppc is required in build directory"

This reverts commit 26671cbf41615cf0c186260df5d6a28050f4f90c.

This change is not required as the previous change was sufficient
to get qemu-system-ppc. Hence reverting the change.
Merge pull request #386 from sharidas/qemuppc-fix

Revert "runqemu.in: qemu-system-ppc is required in build directory"