use LOCAL_PATH properly

Change-Id: I5a177116b976be159042cab51c297861f275daa2
diff --git a/Android.mk b/Android.mk
index edd15f9..720c834 100755
--- a/Android.mk
+++ b/Android.mk
@@ -1 +1,2 @@
-include ./external/svox/pico/Android.mk
+LOCAL_PATH:= $(call my-dir)
+include $(LOCAL_PATH)/pico/Android.mk