Update raspberry_pi.py

Use os.makedirs instead of os.mkdir so the intermediate directory 'originals' will be created

Author: MitchBradley

builder/raspberry_pi.py

@@ -17,7 +17,7 @@
 
 
 if not os.path.exists('micropy_updates/originals/raspberry_pi'):
-    os.mkdir('micropy_updates/originals/raspberry_pi')
+    os.makedirs('micropy_updates/originals/raspberry_pi')
 
 
 unix.REAL_PORT = 'raspberry_pi'