Bug 1363: Java 11: Fix javadoc invocation, drop -source <release> for compile time javac

Also prepare the 'target.releaselevel' property to be set by 'RELEASE_LEVEL' environment,
however - we do not use it at this point.

For now, we build gluegen-rt using '-source 1.8' '-target 1.8'
and the bootclasspath of openjdk8 rt.jar to ensure java8 compatibility.

Alternatively one could use '--release 8' instead using the java11
distributed modules. However, I think the above method is more safe,
only allowing java8 rt.jar to be used for compilation.

Further, gluegen.jar is build using '-target 1.8' only,
since it musty use java11 sources at least for the javadoc taglet.

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