[Patch] Win32 thread primitives

[Vladimir Lipsky]

This patch defines Win32 thread primitives. Actually it consists of the following files:

threads.h.diff
thr_windows.h.diff
threads.t.diff
timer.t.diff

The patch had been applied, I mananged to pass all the tests from t/pmc/thread.reast and t/pmc/timer.t but thread_4.pasm(don't know yet why it fails)

The other files are needed the patch to compile and work properly:

events.c.diff - contains fix for correct deteremination of the tv_nsec value. Now it is always equal to zero.
imcc.l.diff, imcc.y.diff et al - contain a dirty hack which prefixes the CONST lexeme with underscore, otherwise CONST conflicts with MACRO from windows header files. Probably the solution wwould be to prefix all the lexemes with IMCC_ or whatever. Prefixing should be done for thread primitives either.

events.c.diff
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imcc.l.diff

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imcc.y.diff

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imclexer.c.diff

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imcparser.c.diff

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imcparser.h.diff

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main.c.diff

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thr_windows.h.diff

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threads.h.diff

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threads.t.diff

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timer.t.diff

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