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Rollup merge of rust-lang#24005 - ranma42:macosx-no-javac-popup, r=al…
…excrichton MacOS X does not ship with Java installed by default. Instead it includes binary stubs that upon execution pop up a message suggesting the installation of the JDK. Since `javac` is only used when `antlr4` is available, it is possible to work around the popup by only probing for `javac` if `antlr4` has been successfully detected (in which case the JDK is probably already installed on the system). Fixes rust-lang#23138.
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