* vax-nat.c: New file.

* vax-nat.c: New file.
* vaxbsd-nat.c: Tweak comment.
* Makefile.in (ALLDEPFILES): Add vax-nat.c, vaxbsd-nat.c and
vaxnbsd-tdep.c.
(vax-nat.o): New dependency.
* configure.host (vax-*-bsd*, vax-*-ultrix*): Set gdb_host to vax.
(vax-*-ultrix2*): Remove.
* config/vax/vax.mh: New file.
* config/vax/nm-vax.h (vax_kernel_u_addr): New extern declaration.
(KERNEL_U_ADDR): Define as vax_kernel_u_addr.
(vax_register_u_addr): New prototype.
(REGISTER_U_ADDR): Define using vax_register_u_addr.
* config/vax/vaxult2.mh: Remove file.
* config/vax/vaxult.mh: Remove file.
* config/vax/vaxbsd.mh: Remove file.
* config/vax/vax.mt (TM_FILE): Remove.
* config/vax/tm-vaxbsd.h: Remove file.