message: [Build] Clean all coverage files during make clean
  This adds extra paths that were left out and ensures that `.gcda` and `
  .gcno` files are properly cleaned up.
diff: @@ -532,10 +532,16 @@ CLEANFILES = $(EXTRA_LIBRARIES)
  CLEANFILES += *.gcda *.gcno
  CLEANFILES += compat/*.gcda compat/*.gcno
  CLEANFILES += crypto/*.gcda crypto/*.gcno
  +CLEANFILES += libzerocoin/*.gcda libzerocoin/*.gcno
  CLEANFILES += primitives/*.gcda primitives/*.gcno
  +CLEANFILES += rpc/*.gcda rpc/*.gcno
  CLEANFILES += script/*.gcda script/*.gcno
  +CLEANFILES += support/*.gcda support/*.gcno
  CLEANFILES += univalue/*.gcda univalue/*.gcno
  +CLEANFILES += wallet/*.gcda wallet/*.gcno
  +CLEANFILES += wallet/test/*.gcda wallet/test/*.gcno
  CLEANFILES += zmq/*.gcda zmq/*.gcno
  +CLEANFILES += zpiv/*.gcda zpiv/*.gcno
  CLEANFILES += obj/build.h
  EXTRA_DIST =
  