[PATCH] chkstk for Windows

[Yaron Keren]

Calling _chkstk is required on ELF as well as COFF on Windows. Without
_chkstk functions requiring large stack crash in initialization code.
Previous code tested for COFF format but not Mach-O and this patch modifies
the code to test for Windows OS.

Credits to Andrew MacPherson.

Yaron
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