update Xtensa ld scripts

[Bob Wilson]

The linker's elfxtensa.sc file has gotten out-of-sync with the elf.sc  
file.  This patch sync's it back up.  While I was at it, I fixed up a  
few Xtensa-specific issues: adding the .lit4 section that is used for  
some Xtensa processors and including some linkonce sections that are  
generated by Tensilica's XCC compiler.  Tested with an xtensa-elf  
build and committed to CVS.

ld/
	* emulparams/elf32xtensa.sh (TEXT_PLT): Enable.
	(OTHER_READONLY_SECTIONS): Add linkonce .xt_except_table sections.
	(OTHER_READWRITE_SECTIONS): Add linkonce .xt_except_desc sections.
	(OTHER_SDATA_SECTIONS): New.
	* scripttempl/elfxtensa.sc: Import changes from elf.sc.

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