* stable-2.14:
js.bzl: Avoid using deprecated depset union
gwt.bzl: Avoid using deprecated depset union
classpath.bzl: Avoid using deprecated depset union
javadoc.bzl: Avoid using deprecated depset union
pkg_war.bzl: Avoid using deprecated depset union
Update rules_closure to make it forward compatible
Change-Id: I97762abb1544ac0b2d77ab6ecb088abc444233fe