strace: Disable multiple personality support

Multiple personality support in strace is not something that we make use
of in OP-TEE for the moment, so instead of putting more prerequisites on
our builds let us just disable this feature in strace.

Signed-off-by: Joakim Bech <joakim.bech@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>