* timezone/Makefile (zic-deps): New variable.

* timezone/Makefile (zic-deps): New variable.

	($(testdata)/America/New_York): Use it instead of explicit deps.
	($(testdata)/Etc/UTC, $(testdata)/Australia/Melbourne): Likewise.
	($(testdata)/America/Sao_Paulo, $(testdata)/Asia/Tokyo): Likewise.
	(%/UTC %/Universal): New pattern rule, replaces ...
	($(testdata)/UTC, $(testdata)/Universal): ... these removed targets.
	($(testdata)/%/Berlin $(testdata)/%/London): New pattern rule.
	($(testdata)/Europe/London, $(testdata)/Europe/Berlin): Removed.