Changing threading semantics from init early to init before second thread

[Tor Lillqvist]

Havoc Pennington writes:
 > it's a fair amount of code, but most of it is doing stuff dbus doesn't 
 > care about.

But on the other hand it's (to the best of my knowledge) robust,
tested, existing code.

OK, if the threading needs of dbus are *really* trivial (just starting
a thread?), maybe it's overkill, and just using the Microsoft C
library's _beginthreadex() is enough.

--tml