PATCH: Fix gas/mips

[Eric Christopher]

> 
> 	* config/tc-mips.c (md_apply_fix3): Subtract the symbol value 
> 	twice if howto->pcrel_offset is true.
> 
*groan* :) 

I need to look up Ian's mail (I think it was his mail) on why we
subtract the addend twice on these - it _can't_ be right. 

OK for now. Please add a comment on this about subtracting the reloc
twice and describe the situations where it comes about. 

I really gotta find time to fix this. 

-eric

-- 
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