[Xtensa] add default value for new macro

[Bob Wilson]

My change on 2006-01-09 added a new XCHAL_HAVE_WIDE_BRANCHES macro to 
include/xtensa-config.h.  That file is intended to be replaced with values to 
match particular Xtensa processor configurations, and if someone replaces it 
with an older copy of the file, the new macro may be missing.  This patch adds a 
default value in the assembler so that it will still build with an older version 
of the xtensa-config.h header.  Committed on mainline and the 2.17 branch.

2006-04-25  Bob Wilson  <bob.wilson@acm.org>

	* config/xtensa-relax.c (XCHAL_HAVE_WIDE_BRANCHES): Provide default.
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