libcore: libexpat now exports its headers.

Change-Id: I000a85c858b75ea1bf0892abc721c032065556aa
diff --git a/luni/src/main/native/org_apache_harmony_xml_ExpatParser.cpp b/luni/src/main/native/org_apache_harmony_xml_ExpatParser.cpp
index 48defc1..f6f812c 100644
--- a/luni/src/main/native/org_apache_harmony_xml_ExpatParser.cpp
+++ b/luni/src/main/native/org_apache_harmony_xml_ExpatParser.cpp
@@ -31,7 +31,7 @@
 #include <memory>
 
 #include <string.h>
-#include <libexpat/expat.h>
+#include <expat.h>
 
 #define BUCKET_COUNT 128