Android.mk: Change the static compiling mode to shared libraries.

Change-Id: Iab19ac33c26f442338261fac5ca72f65de8439fa
Signed-off-by: Botao Sun <botao.sun@linaro.org>
diff --git a/Android.mk b/Android.mk
index 1a44ebe..30dd063 100644
--- a/Android.mk
+++ b/Android.mk
@@ -36,7 +36,7 @@
 LOCAL_C_INCLUDES += \
 	$(LOCAL_PATH)/include
 
-include $(BUILD_STATIC_LIBRARY)
+include $(BUILD_SHARED_LIBRARY)
 
 include $(CLEAR_VARS)