Exclude watcom from the new unit test too.

 makefile(254): Warning(W18): Unrecognized or out of place character '+'
 makefile(261): Error(E24): More than one command list found for (wrapc)

 http://open.cdash.org/testDetails.php?test=180072076&build=2838488
Merge topic 'fix-transitive-target-names' into next

29dae29 Exclude watcom from the new unit test too.