`java_library`: output JNI headers generated by `javac`

[chrisnovakovic]

The Java compiler outputs header files for Java sources that use the Java Native Interface (JNI), but there's currently no way for them to be consumed by the native-code components that depend on them, preventing them from being built.

Provide the JNI headers as outputs of java_library when cc_hdrs is required. This allows native-code JNI components written in C/C++ to be built by including the java_library target as a dependency.

[peterebden]

Thanks! Would you mind please opening this against https://github.com/please-build/java-rules instead? Those plugin repos are where future development of language-specific rules will happen.

I have a couple of comments too but let's pick the conversation up there :)

[chrisnovakovic]

Thanks! Would you mind please opening this against https://github.com/please-build/java-rules instead? Those plugin repos are where future development of language-specific rules will happen.

I have a couple of comments too but let's pick the conversation up there :)

Will do - I noticed a couple of CI failures in here that I didn't see over there, so I'll fix those, then force-push equivalent changes to https://github.com/please-build/java-rules/pull/13.

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