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PR #1605 made components manage parts of the classpath instead of the
buildserver. This move means that all of AndroidRuntime's dependencies
are managed within components/build.xml, and so we can further
simplify the classpath for all of the targets within the components
module. This change introduces an AndroidRuntime.path reference that
is constructed from the dependencies set created by the aforementioned
PR. It becomes a single point to introduce dependencies targetting the
Android platform, including extension writing, and is used both for
compilation and unit test evaluation.