* Handle setjmp() taking two arguments in Windows.
* src/comp.c: Add `define_setjmp_deps()` and `emit_setjmp()` which
abstract over this difference in behavior between operating systems.
WARNING: Not all cases are handled by this patch. The Mingw-64
setjmp.h header deals with many other combinations. I don't think it
is a good idea to replicate the logic of that header inside
emacs. (Maybe a few lines in the configure script could be added to
handle this problem?)
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