Implement debug breakpoints in DPMI (RFE: #937984). This works if a forked
child can ptrace attach us, i.e. if GDB is not already active and if
DOSEMU is not suid-root or ran via sudo.


git-svn-id: https://dosemu.svn.sourceforge.net/svnroot/dosemu/trunk@1328 7758b857-130e-0410-ab9c-d8735a528d18