systems.
* configure: Regenerate.

* Makefile.in (NO_SHORTNAMES):
* emacsclient.c (NO_SHORTNAMES):
* fakemail.c (NO_SHORTNAMES):
* make-docfile.c (NO_SHORTNAMES):
* movemail.c (NO_SHORTNAMES):
* pop.c (NO_SHORTNAMES): Remove references to obsolete variable.

* config.nt (SHORTNAMES): Remove reference to obsolete variable.

* s/vms4-0.h:
* s/vms4-2.h:
* s/vms4-4.h:
* s/vms5-5.h: Remove, unused.

* s/irix5-2.h:
* s/irix6-0.h:
* s/riscos5.h:
* s/mach-bsd4-3.h:
* m/mips4.h: Remove files for obsolete systems

* Makefile.in:
* filelock.c:
* unexmips.c:
* m/hp9000s300.h:
* m/iris4d.h:
* s/aix3-1.h:
* s/hpux.h:
* s/msdos.h:
* s/usg5-0.h:
* s/usg5-2-2.h:
* s/usg5-2.h:
* s/usg5-3.h: Remove references to obsolete variables.

* s/irix5-0.h: Remove, move all the contents ...
* s/irix6-5.h: ... here.  Simplify.
* config.in: Regenerate.