Let cpuemu generate exceptions when calling int 3 and int 4, to be consistent
with native DPMI and real DOS. The QEMU test now gives equal results for all
three cases (native, JIT, emulated).


git-svn-id: https://dosemu.svn.sourceforge.net/svnroot/dosemu/trunk@1959 7758b857-130e-0410-ab9c-d8735a528d18