Stop bundling ijar's sources in bazel_tools
Stop bundling ijar's sources in bazel_tools

Instead bundle ijar's zipper binary so the skylark rules that depends on it
can use it from @bazel_tools.

A commit introducing windows config settings broke our appengine tutorial.

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MOS_MIGRATED_REVID=114857080

robbiemc/rules_groovy,bazelbuild/rules_groovy