interpreter: only build PowerPC backend for JIT on linuxppc64gcc
interpreter: only build PowerPC backend for JIT on linuxppc64gcc

There is no need to built backend for any other architecture expect
PowerPC on PowerPC machine.

Signed-off-by: David Abdurachmanov <3747debe97ca693bc6b62ba4169dd2a50fce172c@cern.ch>
Signed-off-by: Danilo Piparo <866ed6f288e41d68fafde22d35ed1a04986fa45f@cern.ch>

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