Finer grained control over tests.

2013-04-16  Jeremy Bennett <jeremy.bennett@embecosm.com>

	* run-tests.sh: Add options to select and de-select individual
	tools to test and set corresponding environment variables.
	* run-elf32-tests.sh, run-uclibc-tests.sh: Use environment
	variables to control which tests are run.

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