remove dependency of EGL on ndk header

Change-Id: Ia6e489b5b4f028864bdf54923e81f604710dd8ad
diff --git a/libs/gui/Surface.cpp b/libs/gui/Surface.cpp
index 72b27ed..059f313 100644
--- a/libs/gui/Surface.cpp
+++ b/libs/gui/Surface.cpp
@@ -21,6 +21,8 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 
+#include <android/native_window.h>
+
 #include <utils/CallStack.h>
 #include <utils/Errors.h>
 #include <utils/Log.h>