[BRLTTY] Losing cursor in the latest versions from SVN

[Dave Mielke]

Would everyone who has experienced this problem please retest it with the 
latest revision. I believe I've figured it out.

While the SD API doesn't create subprocesses, it does spawn event threads. 
Those threads had no way to know that the main thread, i.e. brltty, was 
counting on having exclusive control over whether or not the death of child 
signal was being blocked or handled so they inbterfered with brltty's ability 
to know when its cursor routing subprocess had terminated.

Since this change has involved some low-level stuff related to cursor routing, 
please do let me know immediately if you encounter any sort of problem(s) 
pertaining to that feature.

-- 
Dave Mielke           | 2213 Fox Crescent | The Bible is the very Word of God.
Phone: 1-613-726-0014 | Ottawa, Ontario   | 2011 May 21 is the Day of Judgement.
EMail: dave at mielke.cc | Canada  K2A 1H7   | 2011 Oct 21 is the End of the World.
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