File tulip-libpng16.patch of Package tulip

--- library/tulip-ogl/src/GlTextureManager.cpp.old	2013-04-09 09:11:38.541469488 +0200
+++ library/tulip-ogl/src/GlTextureManager.cpp	2013-04-09 09:11:54.557541872 +0200
@@ -31,6 +31,7 @@ extern "C" {
 
 #include <jpeglib.h>
 #include <png.h>
+#include <string.h>
 };
 
 //====================================================