Add rpi specific compile options.
Increase squeezelite revision to 496.
Fix problem opening ALSA device if 44100 is not supported. (b03b568c0fb24a9de82288b10429da359ece5016)
Increase squeezelite revision to 497.
Trap use of hardware mac address (9094ec549aa6162cb1edd70025faa4f701971540)
Increase squeezelite version to 1.6.5, revision to 499.