Make SDK build happy for the combined v4 binary

Change-Id: Iaf150f697a1928665c5bd4b2fa9ee994f43244cc
diff --git a/core-combined/Android.mk b/core-combined/Android.mk
index e15de1c..d183f4d 100644
--- a/core-combined/Android.mk
+++ b/core-combined/Android.mk
@@ -24,7 +24,7 @@
 include $(CLEAR_VARS)
 LOCAL_USE_AAPT2 := true
 LOCAL_MODULE := android-support-v4
-LOCAL_SDK_VERSION := $(SUPPORT_CURRENT_SDK_VERSION)
+LOCAL_SDK_VERSION := 9
 LOCAL_STATIC_JAVA_LIBRARIES := \
     android-support-compat \
     android-support-media-compat \