scripts/unit-test: Don't run valgrind on ppc64

When implementing meson support I forgot to include the check to make
sure we don't run valgrind for ppc64 builds. This adds the check that is
used in our autotools and cmake builds already.

Change-Id: I70390c415da2b381714f0374630b9a595aa299a5
Signed-off-by: William A. Kennington III <wak@google.com>
1 file changed