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(mips-mips-riscos5*): New alternative.

(bindir, datadir, sharedstatedir, libexecdir)
(mandir, infodir, archlibdir): Initializations deleted.

On hpux9, use hpux9-x11r4.h if we have X11R4.
On hpux9shr, use hpux9shxr4.h.

Added target mips-dec-mach_bsd4.3.