Add support for using sdk_version: "module_<ver>"

Fixes a panic when trying to build something with
sdk_version: "module_30".

Test: m nothing
Change-Id: I9b2ce50957f59e2bead335ffa58888e15cda1f78
diff --git a/java/testing.go b/java/testing.go
index a472413..461fd3f 100644
--- a/java/testing.go
+++ b/java/testing.go
@@ -55,6 +55,8 @@
 		"prebuilts/sdk/30/public/framework.aidl":                   nil,
 		"prebuilts/sdk/30/system/android.jar":                      nil,
 		"prebuilts/sdk/30/system/foo.jar":                          nil,
+		"prebuilts/sdk/30/module-lib/android.jar":                  nil,
+		"prebuilts/sdk/30/module-lib/foo.jar":                      nil,
 		"prebuilts/sdk/30/public/core-for-system-modules.jar":      nil,
 		"prebuilts/sdk/current/core/android.jar":                   nil,
 		"prebuilts/sdk/current/public/android.jar":                 nil,