Add flag for gdbserver build.

2013-02-27  Jeremy Bennett <jeremy.bennett@embecosm.com>

	* build-uclibc.sh: Add ARC_LEGACY_PTRACE_ABI defintion when
	building gdbserver.
Added support for building a big endian ARC toolchain.
Merge remote-tracking branch 'arc/arc_4_8-toolchain-dev' into arc_4_8-toolchain-gdb-testing

Conflicts (resolved):
	ChangeLog
	build-elf32.sh
	build-uclibc.sh
	run-uclibc-tests.sh