Try not to install espeak to reduce size

builder/test/tests.py

@@ -25,7 +25,7 @@ import pymavlink
 from pymavlink import mavutil
 import rpi_ws281x
 import pigpio
-from espeak import espeak
+# from espeak import espeak
 from pyzbar import pyzbar
 
 print cv2.getBuildInformation()

builder/test/tests.sh

@@ -32,7 +32,7 @@ monkey --version
 pigpiod -v
 i2cdetect -V
 butterfly -h
-espeak --version
+# espeak --version
 mjpg_streamer --version
 
 # ros stuff