Updating makefile to use the current SDK

Change-Id: I9e0f3f6d329098b40b704be6f60200110be5ed0e
diff --git a/Android.mk b/Android.mk
index d7bfdd4..2e57478 100644
--- a/Android.mk
+++ b/Android.mk
@@ -23,31 +23,21 @@
 
 LOCAL_MODULE_TAGS := optional
 
-LOCAL_STATIC_JAVA_LIBRARIES := android-support-v4
-
 LOCAL_SRC_FILES := $(call all-java-files-under, src) \
     $(call all-java-files-under, WallpaperPicker/src) \
-    $(call all-renderscript-files-under, src) \
     $(call all-proto-files-under, protos)
 LOCAL_RESOURCE_DIR := $(LOCAL_PATH)/WallpaperPicker/res $(LOCAL_PATH)/res
-
-LOCAL_AAPT_FLAGS := --auto-add-overlay
+LOCAL_PROGUARD_FLAG_FILES := proguard.flags
+LOCAL_STATIC_JAVA_LIBRARIES := android-support-v4 android-support-v7-recyclerview
 
 LOCAL_PROTOC_OPTIMIZE_TYPE := nano
 LOCAL_PROTOC_FLAGS := --proto_path=$(LOCAL_PATH)/protos/
+LOCAL_AAPT_FLAGS := --auto-add-overlay
 
-LOCAL_SDK_VERSION := 21
-LOCAL_STATIC_JAVA_LIBRARIES := \
-        android-support-v4 \
-        android-support-v7-recyclerview
-
+LOCAL_SDK_VERSION := current
 LOCAL_PACKAGE_NAME := Launcher3
-#LOCAL_CERTIFICATE := shared
-
 LOCAL_OVERRIDES_PACKAGES := Launcher2
 
-LOCAL_PROGUARD_FLAG_FILES := proguard.flags
-
 include $(BUILD_PACKAGE)
 
 #