[Xtensa] update include/xtensa-config.h to match gcc

[Bob Wilson]

I've committed this patch to update the xtensa-config.h header.  This isn't 
currently needed for binutils or gdb, but the file needs to stay in sync with gcc.

2007-07-18  Bob Wilson  <bob.wilson@acm.org>
	
	* xtensa-config.h (XCHAL_HAVE_THREADPTR): New.
	(XCHAL_HAVE_RELEASE_SYNC, XCHAL_HAVE_S32C1I): New.
	
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