Add builtin_define of __xtensa__ (for Xtensa, of course)

[Bob Wilson]

It seems that most GCC ports provide a built-in definition of the processor name 
in lowercase.  The Xtensa port has been defining "__XTENSA__" in uppercase only. 
   This patch adds a lowercase "__xtensa__" built-in definition.  Committed as 
obvious on the mainline and 3.4 branch.

2004-02-26  Bob Wilson  <bob.wilson@acm.org>

	* config/xtensa/xtensa.h (TARGET_CPU_CPP_BUILTINS): Define __xtensa__.


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