Dist the javac-compiled stubs jars

The header jars are compiled with turbine, which produces a jar that
is less compliant to the class file spec than when compiled with
javac.  Since the dist'ed jars may be shipped with the SDK, use
the javac version for maximum compatibility.

Bug: 119841341
Test: forrest SDK build
Change-Id: I745c8dd0305d95ae9ce025a9c23e51a99ebb0a3b