Patch for opcodes portability botch

[Alan Modra]

On Wed, 12 Apr 2000, Michael Sokolov wrote:

> 	lotsa files: Everyone includes sysdep.h, it is
> 	necessary for const.

But it's not necessary for const.  That's done in ansidecl.h, which you've
removed and replaced with sysdep.h in some of these files.  Including
sysdep.h is not that bad a thing, but if you do then it would be cleaner
to remove <stdio.h> and others like it from the top level file as they are
in sysdep.h

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