APEX now correctly tracks jni_lib dependencies

Bug: 144135069
Test: m (apex_test.go amended)
Change-Id: If9dde4e2e62c2642267dbcac68bab76a032682c0

java/java.go

@@ -430,6 +430,11 @@ type jniDependencyTag struct {
 	target android.Target
 }
 
+func IsJniDepTag(depTag blueprint.DependencyTag) bool {
+	_, ok := depTag.(*jniDependencyTag)
+	return ok
+}
+
 var (
 	staticLibTag          = dependencyTag{name: "staticlib"}
 	libTag                = dependencyTag{name: "javalib"}