x86 gas aout emulation support

[Ian Lance Taylor]

   Date: Mon, 24 Jan 2000 11:26:32 +1030 (CST)
   From: Alan Modra <alan@SPRI.Levels.UniSA.Edu.Au>

   !       (&S_GET_OTHER == 0 || &S_GET_DESC == 0

This usage seems somewhat awkward and error-prone.

Suppose we instead require that any multi-capable target define these
functions as noops?  Or perhaps we can clean it up in some other
way--calling a.out specific code from read.c like that is really
historical baggage from when gas only supported a.out.

Ian