[m-rev.] for review: add missing prereqs for .class files

[Zoltan Somogyi]

For review by anyone. I am particularly seeking feedback on
the two XXXs that this diff adds to the code handling
module_target_java_class_code.

I would also appreciate it if someone could point me towards
a description of the rules that Java compilers use to decide
what other .java files they pay attention to when compiling
a specific .java file. I tried googling the question, but the results
are all about the distinction between private/protected/public,
which I already know.

Zoltan.
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