Multi-arching FLOAT_INFO

[Richard Earnshaw]

So it turns out that multi-arching FLOAT_INFO may not be completely 
trivial either.  Only two ports really make use of this: ARM and i386.  
The ARM code is straight-forward, but the code on the i386 is largely 
disabled.  Indeed, the largest problem is i386b-nat.c which contains a 
large chunk of code that is surrounded in "#ifdef FLOAT_INFO".  This file 
seems to only be used on BSD4.4 systems (FreeBSD, NetBSD and OpenBSD all 
seem to use their own nat files -- I'm not sure what BSDi uses).

Since adding FLOAT_INFO to gdbarch will mean that it is now 
unconditionally defined the question is - how to handle this chunk of 
code.  I've no idea (and no way of testing) whether it will even compile 
cleanly.

Does anyone even use a system that relies on this file now?

Suggestions welcome.

R.