[PATCH] workaround for sigproc_init

[jojelino]

As sigproc_init is called during dll initialization, wait_sig thread is 
not created as soon as possible.(this is known in msdn createthread 
reference. http://msdn.microsoft.com/en-us/library/ms682453(v=vs.85).aspx)
And then wait_sig starts to wake up as sig_dispatch_pending enters 
waitforsingleobject. then main thread stops for few ms. and it shows 
poor performance.
as a workaround, issue user apc call, let the os decide when to call them.
And the result was quite good. patch,changelog modified are attached.
Please review it.

Regards.
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