Fix aapt to get expat header files from the approved location.

Change-Id: Ic7c796e048cfe98ee355c18b3708fee5ea716e2e
diff --git a/tools/aapt/Android.mk b/tools/aapt/Android.mk
index 482f43e..d9b0681 100644
--- a/tools/aapt/Android.mk
+++ b/tools/aapt/Android.mk
@@ -34,7 +34,6 @@
 endif
 
 
-LOCAL_C_INCLUDES += external/expat/lib
 LOCAL_C_INCLUDES += external/libpng
 LOCAL_C_INCLUDES += external/zlib
 LOCAL_C_INCLUDES += build/libs/host/include
diff --git a/tools/aapt/StringPool.h b/tools/aapt/StringPool.h
index d501008..16050b2 100644
--- a/tools/aapt/StringPool.h
+++ b/tools/aapt/StringPool.h
@@ -21,7 +21,7 @@
 #include <ctype.h>
 #include <errno.h>
 
-#include <expat.h>
+#include <libexpat/expat.h>
 
 using namespace android;