Enable Java regression tests

The primary `make test` goal now also runs the cbmc-java
test subdirectory.

Author: smowton

regression/Makefile

@@ -1,5 +1,5 @@
 
-DIRS = ansi-c cbmc cpp goto-instrument goto-analyzer
+DIRS = ansi-c cbmc cpp goto-instrument goto-analyzer cbmc-java
 
 test:
 	$(foreach var,$(DIRS), $(MAKE) -C $(var) test || exit 1;)