make-release: Do builds with the official source release, to test that it works
Bugfix: make-release: Correctly avoid unused parts of ccan
make-release: Ensure ccan licenses get included in source
make-release: Include ccan LICENSE symlinks as symlinks even in ZIP
Merge commit '715f1b3' into bfgminer
Merge branch 'upstream_ccan' into bfgminer

Conflicts:
	make-release