Improve building a canadian cross compiler.

	* build-toolchain.sh: Build ncurses when Canadian Cross compiling.
	Add native build to path between stages when Canadian Cross compiling.
use software-cache versions of repos.

	* component-versions: Changed to software-cache versions of
	binutils, gcc, cgen and newlib.
	* download-toolchain.sh: Likewise.
Merge branch '2014.08.rc' into jeremy-sdk-script-patch