Update ZLibInterface.cpp for new paths.

Change-Id: Idc90cd3e45b9b3db7b3233fb502d13c3e5a47bb7
diff --git a/Source/FreeImage/ZLibInterface.cpp b/Source/FreeImage/ZLibInterface.cpp
index 5a147df..4610a2f 100644
--- a/Source/FreeImage/ZLibInterface.cpp
+++ b/Source/FreeImage/ZLibInterface.cpp
@@ -27,7 +27,7 @@
 #elif defined(WIN32) || defined(_WIN32)
 #include <zutil.h>	/* must be the last header because of error C3163 in VS2008 (_vsnprintf defined in stdio.h) */
 #else
-#include "../../../zlib-1.2.3/zutil.h"
+#include "../../../zlib/zutil.h"
 #endif
 
 /**