OFW should turn off microphone

[Mikus Grinbergs]

Noticed there's a new q2e19.  But it, like its predecessors, leaves 
the microphone "alive" (to be turned off, at about the fourth dot, 
by the loading of the os).

I deliberately avoid saying anything while the XO boots, in case it 
is surreptitiously recording me.  But I *wish* OFW would turn the 
microphone off when done - to me the caution: "when booting, watch 
what you say"  is an unnecessary responsibility for OLPC users.

mikus