First version of board description for bare metal nSim.

	* dejagnu/baseboards/arc-sim.ex: Remove redundant use of
	arc-sim-base.
	* dejagnu/baseboards/arc-nsim.exp: New file.

Conflicts (resolved):
	dejagnu/baseboards/arc-sim.exp
Tidy up kernel building.

	* build-kernel.sh: Some improvements for Linux 3.8.
Merge branch 'arc-toolchain-mainline' of github.com:foss-for-synopsys-dwc-arc-processors/toolchain into arc-toolchain-mainline

Conflicts (resolved):
	dejagnu/baseboards/arc-nsim.exp