recovery: Generate libminui dynamic library

Allow factory test images to use minui functionaltiy
by making use of libminui dynamic library.

Change-Id: I63e77420d5addbcc6eebeedc213f629085766b4c
diff --git a/minui/Android.mk b/minui/Android.mk
index df4aac1..aee2a34 100644
--- a/minui/Android.mk
+++ b/minui/Android.mk
@@ -30,3 +30,10 @@
 endif
 
 include $(BUILD_STATIC_LIBRARY)
+
+# Used by OEMs for factory test images.
+include $(CLEAR_VARS)
+LOCAL_MODULE := libminui
+LOCAL_WHOLE_STATIC_LIBRARIES += libminui
+LOCAL_SHARED_LIBRARIES := libpng
+include $(BUILD_SHARED_LIBRARY)