tests/run-perfbench.py: Fix native feature check.
tests/run-perfbench.py: Fix native feature check.

This was broken by 8459f538eb45fd8e1e4d614298449cf18de84d75

Signed-off-by: Damien George <99e6b749acbfbe2a596df99e91d24d6e1fdbee00@micropython.org>

adafruit/circuitpython,adafruit/circuitpython,bvernoux/micropython,adafruit/circuitpython,bvernoux/micropython,henriknelson/micropython,henriknelson/micropython,henriknelson/micropython,bvernoux/micropython,adafruit/circuitpython,henriknelson/micropython,adafruit/circuitpython,bvernoux/micropython,adafruit/circuitpython,henriknelson/micropython,bvernoux/micropython