Provide command line control over parallelism. Backport from
arc_4_8-toolchain-dev branch.

2013-01-31  Jeremy Bennett <jeremy.bennett@embecosm.com>

	* build-all.sh, run-tests.sh: Add options to control parallelism
	* all-version.sh: Remove specification of PARALLEL

Conflicts:
	ChangeLog (resolved).
Add back accidental deletion.

2013-02-01  Jeremy Bennett <jeremy.bennett@embecosm.com>

	* build-all.sh (--enable-multilib, --disable-multilib): Add
	argument handling accidentally deleted.
Break out generic Linux board set up, add new nSim specific board and allow
hostname to be specified by environment variable.

2013-02-01  Jeremy Bennett <jeremy.bennett@embecosm.com>

	* dejagnu/baseboards/arc-linux-aa4.exp: Break out the generic
	Linux setup into its own file, specify target in environment variable.
	* dejagnu/baseboards/arc-linux-generic.exp: Generic set up shared
	between all Linux boards.
	* dejagnu/baseboards/arc-linux-nsim.exp: Created.
	* run-tests.sh (--target): New option to specify target address.
2013-02-01  Jeremy Bennett <jeremy.bennett@embecosm.com>

	* build-all.sh: Add option to control building of unified source
	tree.