* xm-hp300bsd.h: Define PSIGNAL_IN_SIGNAL_H and put a compatible
definition here, to handle both BSD 4.3 and 4.4 systems.
* tm-i386bsd.h (NUM_REGS): There are only eleven, not twelve.
* tm-i386bsd.h, xm-i386bsd.h: New config files.
* i386b-nat.c: New native support file.
* configure.in: Add host and target for i[34]86-*-bsd*.
* config/i386bsd.mh, config/i386bsd.mt: New config files.