msvcrt: Make EXCEPTION_PRIV_INSTRUCTION generate SIGILL.

[Philip Nilsson]

This patch makes EXCEPTION_PRIV_INSTRUCTION generate SIGILL.

I have verified the behavior on Vista with a simple application that
registers a signal handler for SIGILL and then attempts to use the
privileged instruction `cli'.

I think I read somewhere that the state of the program is invalid after
catching such an exception, so a testcase is in theory impossible...

http://h21007.www2.hp.com/portal/download/files/unprot/Fortran/docs/vf-html/pg/pg2ahsqq.htm
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