...instead of only to instdir, as happened after
2e47462d "jvmfwk: install also into instdir," so
that CppunitTests (which still run against solver) can use jvmfwk.  This will
become moot when solver is eventually dropped.

Change-Id: Ic2cdbf32e20a79f8cc6ac2088e4bc47dcd6f5cc5