Update to espeak.c: increase the max rate

[Bill Cox]

The most recent version of espeak has some pretty nice high speed
performance.  Storm Dragon listens at a rate of 675 in Orca with a
slightly modified speech-dispatcher.  The current max rate is hard
coded in espeak.c to 390.  This should be increased to at least what
Storm uses.  I'm using 800 in the package for Vinux I updated
yesterday, which means Storm uses 90% in his Orca settings.

This is a pretty minor one-line patch, which I've attached.

Bill
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