[PATCH 05/15] Add hle.h base header

[Roland McGrath]

> In several other projects right now I've used an opcode compatability
> layer, just like Andi is, so that features can be compiled in that
> binutils does not support yet.
> 
> And it is an entirely reasonable thing to do.

It is a reasonable thing to do when there is good reason to worry about
people building with older tools and needing the new code.  This is not
such a case.