Match the minimum version in the manifest.

Change-Id: Iab7d34552df5cf3830ec03c36872879b9ba28d7e
diff --git a/jni/Android.mk b/jni/Android.mk
index 6053d27..dbc0674 100644
--- a/jni/Android.mk
+++ b/jni/Android.mk
@@ -29,7 +29,7 @@
 
 LOCAL_CFLAGS += -Wall -Wno-unused-parameter -Wno-switch
 
-LOCAL_SDK_VERSION := 9
+LOCAL_SDK_VERSION := 19
 LOCAL_NDK_STL_VARIANT := c++_static # LLVM libc++
 
 include $(BUILD_SHARED_LIBRARY)