Fix cts build.

Change-Id: I3916d78075b0465a31c7abbfa718dc619ebe79fc
diff --git a/build/test_gtest_package.mk b/build/test_gtest_package.mk
index 2f4c9bb..6ecd798 100644
--- a/build/test_gtest_package.mk
+++ b/build/test_gtest_package.mk
@@ -21,6 +21,7 @@
 
 # Disable by default so "m cts" will work in emulator builds
 LOCAL_DEX_PREOPT := false
+LOCAL_PROGUARD_ENABLED := disabled
 
 include $(BUILD_PACKAGE)