Revert "Use explicit support library prebuilts"

This reverts commit 41cbf856e79a56b73384eed9808e1a3e77347fc2.

Change-Id: Ifcb8b390988b21da8f6ffef214f2c957908912b1
diff --git a/Android.mk b/Android.mk
index 47a3fa5..0a74c12 100644
--- a/Android.mk
+++ b/Android.mk
@@ -20,6 +20,10 @@
 
 LOCAL_SRC_FILES := $(call all-java-files-under, src gen)
 
+LOCAL_PROGUARD_FLAG_FILES := ../../../frameworks/support/design/proguard-rules.pro
+LOCAL_PROGUARD_FLAG_FILES += ../../../frameworks/support/v7/preference/proguard-rules.pro
+LOCAL_PROGUARD_FLAG_FILES += ../../../frameworks/support/v7/recyclerview/proguard-rules.pro
+
 LOCAL_STATIC_JAVA_LIBRARIES := android-support-design-prebuilt
 LOCAL_STATIC_JAVA_LIBRARIES += android-support-percent-prebuilt
 LOCAL_STATIC_JAVA_LIBRARIES += android-support-transition-prebuilt