Port _setjmp fix to POSIXish hosts as well as Microsoft.
* nt/config.nt: Attempt to sync with autogen/config.in. (HAVE_SIGSETJMP, HAVE__SETJMP): New macros. (_longjmp, _setjmp): Remove. * src/image.c (_setjmp) [!HAVE__SETJMP]: Restore definition, as it's needed on POSIXish hosts that lack _setjmp. Attempt to solve the Microsoft problem in a different way, by altering nt/config.nt.
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