Remove javacutil from errorprone

checkerframework/dataflow-errorprone-3.15.0.jar already contains a
shaded version of javacutil, the separate javacutil jar doesn't seem
to be necessary, remove it.

Test: m RUN_ERROR_PRONE=1 javac-check
Change-Id: I1cbd4847a659d0c51efcf014af66e2e09629ed25
9 files changed