Prepare for removal of legacy-test from default targets

In preparation for removing junit classes from the Android API
the legacy-test target will be removed from the
TARGET_DEFAULT_JAVA_LIBRARIES. This change adds explicit
dependencies on junit and/or legacy-android-test to ensure that
modules will compile properly once it is removed.

Bug: 30188076
Test: make checkbuild
Change-Id: I13e88297731253420e4e5f5291d503f13a39a156
diff --git a/tests/Compatibility/Android.mk b/tests/Compatibility/Android.mk
index c2f89dd..99e84bd 100644
--- a/tests/Compatibility/Android.mk
+++ b/tests/Compatibility/Android.mk
@@ -19,6 +19,7 @@
 LOCAL_MODULE_TAGS := tests
 
 LOCAL_JAVA_LIBRARIES := android.test.runner
+LOCAL_STATIC_JAVA_LIBRARIES := junit legacy-android-test
 # Include all test java files.
 LOCAL_SRC_FILES := \
 	$(call all-java-files-under, src)