Optional symbols on IRIX

[David Kaelbling]

A couple days ago I mailed in a patch to use _MIPS_SYMBOL_PRESENT to
test at run-time whether jlimit_startjob() was present IRIX systems.  I
neglected to mention that the patch I sent in wasn't entirely complete:
a _real_ fix would test '#include <optional_sym.h>' in configure, and
also require either the MipsPRO 7.2.x or MipsPRO 7.3.1.3 or newer
compiler.

	David

-- 
David KAELBLING <drk at sgi.com>	    Silicon Graphics Computer Systems
1 Cabot Rd, suite 250; Hudson, MA 01749	    781.839.2157, fax ...2357