Remove bash specific constructs as far as possible (a few remain).

	* arc-clone-all.sh: Remove bash specific constructs.
	* arc-init.sh: Likewise.
	* build-uclibc.sh: Likewise.
	* get-random-port.sh: Likewise.
	* rel-rpaths.sh: Likewise.
	* run-elf32-tests.sh: Likewise.
	* run-uclibc-tests.sh: Likewise.
	* tag-release.sh: Likewise.