[Xtensa] fix testsuite failures

[Bob Wilson]

I've most often been running the binutils testsuites with an xtensa-elf target, 
often without a cross-compiler on my path.  Today I tried with an 
xtensa-linux-uclibc target where the compiler was also available, and it exposed 
a few problems.  I've committed this patch to fix them.

2008-02-04  Bob Wilson  <bob.wilson@acm.org>
	
binutils/testsuite/
	* binutils-all/objdump.exp (cpus_expected): Add xtensa.

ld/testsuite/
	* ld-undefined/undefined.exp: XFAIL for xtensa*-*-linux*.

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