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(unexec): Use it.  Also simplify previous changes.

New variable new_offsets_shift used instead of new_data2_size
since they are not always the same.  Simplify logic for copying
the headers and inserting new ones.

	* unexelfsgi.c: New file; like unexelf.c, but tolerates program
	segments above BSS.
	* m/iris5d.h: New file.
	* s/irix5-0.h: New file.
	* process.c [__sgi] (allocate_pty): Give up immediately if pty is
	inaccessible.

headers will be in ascending order.  This will prevent the unexeced
emacs that being processed by other applications (such as strip)
to fail.

Handle rounding of section boundaries.
(round_up): New function.