Updated PROGMEM data types for current avr-libc.
Updated PROGMEM data types for current avr-libc.

fepblaster/Webduino,pbystrup/Webduino,m-mcgowan/Webduino,m-mcgowan/Webduino,meg23/Webduino,kasperkamperman/Webduino,kasperkamperman/Webduino,weese/Webduino