Disable desugaring of JCTF tests and add fixed dependency on Junit

Junit has references to java.lang.management which is not avaiable in
the android runtime, thus desugaring reports a warning. The tests are
fairly old so there should be no need for desugaring.

Change-Id: I7383f44876a62e3986a248ddb34829fbacdbf408
diff --git a/build.gradle b/build.gradle
index dc90666..54a04a0 100644
--- a/build.gradle
+++ b/build.gradle
@@ -272,6 +272,7 @@
                 "jacoco",
                 "jasmin",
                 "jctf",
+                "junit",
                 "jdwp-tests",
                 "kotlin",
                 "openjdk/openjdk-rt-1.8",