ARM EABI uclinux config tweaks

[Paul Brook]

The attached patch tweaks the arm-uclinuxeabi config so that it actually 
works.  The linker needs various special flags to generate correct binaries, 
and we need to select the right unwinding table format.

Tested on arm-uclinuxeabi.
Applied to svn trunk.

Paul

2008-03-20  Paul Brook  <paul@codesourcery.com>

	gcc/
	* config.gcc (arm*-*-uclinux*): Remove duplicate arm/uclinux-elf.h.
	* config/arm/uclinux-eabi.h (SUBTARGET_EXTRA_LINK_SPEC): Add extra
	linker flags.
	* config/arm/bpabi.h (SUBTARGET_EXTRA_LINK_SPEC): Provide default
	definition.
	(LINK_SPEC): Use SUBTARGET_EXTRA_LINK_SPEC.
	* config/arm/unwind-arm.h (_Unwind_decode_target2): Add uClinux.
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