Don't recompile core-tests after installclean

Instead of using the installed copy of filesystemstest.jar as an input,
create an intermediate that is named appropriately, and use that
instead.

Also removes all the LOCAL_ADDITIONAL_DEPENDENCIES := JavaLibrary.mk
that we just strip out in the build system anyways.

Test: Compare core-tests_intermediates/classes.jack before/after
Test: m -j core-tests; m installclean; m -j core-tests
Test: cts-tradefed run cts -m CtsLibcoreTestCases -t libcore.java.nio.file.FileSystemsTest
Change-Id: I7f8f3c187c1ac33e017372b2f8f01884c4c1c796