Remove Vax Ultrix and VAX BSD support

Remove Vax Ultrix and VAX BSD support

Built and tested on x86_64 Fedora 20, with --enable-targets=all.

gdb/
2014-10-24  Pedro Alves  <palves@redhat.com>

	* Makefile.in (ALLDEPFILES): Remove vax-nat.c.
	* NEWS (Removed targets): Add VAX BSD and VAX Ultrix.
	* config/vax/vax.mh: Delete.
	* configure.host: Move vax-*-bsd* and vax-*-ultrix* to the
	obsolete configurations section.
	* configure.tgt (vax-*-*): Don't mention 4.2BSD nor Ultrix.
	* vax-nat.c: Delete file.

gdb/testsuite/
2014-10-24  Pedro Alves  <palves@redhat.com>

	* gdb.base/corefile.exp: Remove references to ultrix.
	* gdb.base/interrupt.exp: Likewise.
	* gdb.base/whatis.exp: Likewise.
	* gdb.gdb/selftest.exp: Likewise.
	* gdb.threads/manythreads.exp: Likewise.
	* gdb.threads/print-threads.exp: Likewise.
	* gdb.threads/pthreads.exp:: Likewise.
	* gdb.threads/schedlock.exp: Likewise.