make spd_open threadsafe

[Jeremy Whiting]

In kttsd I was encountering a crash when I called spd_open from one class to 
check to see if speech-dispatcher is running, then call spd_open from a dialog 
invoked by the previous class to get some data from speech-dispatcher 
(available languages, and voices, etc.)

Because g_get_user_name() returns a static char * which is then free'd at the 
end of the method, the second call to spd_open crashes.  I've included a patch 
for the crash that fixes it in my case.

thanks,
Jeremy
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