[Xtensa] sync include/xtensa-config.h with binutils

[Bob Wilson]

This patch is to keep the include/xtensa-config.h file the same as the version 
in binutils and gdb.  Neither GCC nor GDB currently uses the new macros. 
Committed on the mainline.

2006-11-27  Bob Wilson  <bob.wilson@acm.org>

	* xtensa-config.h (XSHAL_ABI): New.
	(XTHAL_ABI_WINDOWED, XTHAL_ABI_CALL0): New.
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