mesa3d: expat now exports its headers.

Change-Id: I3e8da461a498fdfe6cdd018c12f5ad367c7a14f9
diff --git a/src/mesa/drivers/dri/Android.mk b/src/mesa/drivers/dri/Android.mk
index 577f664..41f9074 100644
--- a/src/mesa/drivers/dri/Android.mk
+++ b/src/mesa/drivers/dri/Android.mk
@@ -40,7 +40,6 @@
 	$(addprefix $(MESA_TOP)/, $(mesa_dri_common_INCLUDES)) \
 	$(DRM_TOP) \
 	$(DRM_TOP)/include/drm \
-	external/expat/lib
 
 MESA_DRI_WHOLE_STATIC_LIBRARIES := \
 	libmesa_glsl \