[RFC] Fix IRIX 6.5 math.h header for PR fortran/15930

[Richard Sandiford]

"Billinghurst, David (CALCRTS)" <david.billinghurst@comalco.riotinto.com.au> writes:
> This patch to the IRIX 6.5 header internal/math_core.h (included by math.h) 
> addresses PR fortran/15930, and also fixes some libstdc++ failures.  
> Work is incomplete, as there are two new FAILs (below).  I just want some
> feedback to ensure the fix is heading in the right direction.

Feeling guilty that no-one's replied to this yet.  FWIW, I don't feel
qualified to offer an opinion since our (much older) release of IRIX
doesn't have these definitions.  I also have no idea about fixincludes
stuff.

Richard