arihppa.d cleanup

[Will N. <wi...@mi...>]

This patch reorganizes arihppa.d a little bit so that it compiles with gcc 
and hopefully HP CC. I haven't actually changed any of the code. There are a 
couple of sections of code that are #ifdef 0'd out. I didn't want to remove 
these in case someone wants them kept (I moved them to the bottom of the 
file) but they haven't been altered in over 4 years, since clisp moved to 
sourceforge, so I would think they can be deleted. Otherwise the changes are 
syntactic to make the GNU assembler happy.

Sorry the patch is such a mess, but it's the nature of the changes.