[Xtensa] fix regression from previous change

[Bob Wilson]

One of my changes from 2007-10-05 introduced a bug in the linker.  I changed the 
relax_section function to avoiding generating a fix record for a DIFF 
relocation.  That was correct in the context of that change since the relaxation 
can never cause a DIFF reloc to refer to a symbol in another input file.  My 
change was not correct, though, because it also prevented the addend in DIFF 
relocations from being updated to account for relaxation.  I've committed this 
patch to fix it.

2007-12-21  Bob Wilson  <bob.wilson@acm.org>

	* elf32-xtensa.c (relax_section): Update DIFF relocations in the
	same way as other relocations.
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