Centralise common data in scripts.

2013-03-28  Jeremy Bennett <jeremy.bennett@embecosm.com>

	* build-all.sh: Invoke define-release.sh to set RELEASE, LOGDIR
	and RESDIR environment variables and create $LOGDIR and $RESDIR
	directories if necessary.
	* build-elf32.sh, build-uclib.sh: Use RELEASE environment variable
	for all release specific files/directories, use LOGDIR as directory
	for log files. Correct operator in test for PDF generation.
	* define-release.sh: New script.
	* run-elf32-tests.sh, run-uclibc-tests.sh: Use RELEASE environment
	variable for all release specific files/directories, use LOGDIR as
	directory for log files, use RESDIR as directory for all results
	sub-directories