Allow specify nojdk and non-release commit

[c-parsons]

It looks like one cannot specify a non-release commit (e.g. USE_BAZEL_VERSION=last_green) as well as BAZEL_NOJDK=1 to download a nojdk Bazel.

Instead, it will download a jdk Bazel (BAZEL_NOJDK is ignored).

This seems like a simple arg-parsing oversight. (FWIW, BAZEL_NOJDK isn't even documented, so perhaps its a mostly-untested feature?)

[tradergt]

For the java part, looks like there was a push to support NOJDK
#531
It has not been released yet though

[fweikert]

I'll cut a new release