Fix compilation with gcc-4.1

Index: hydrogen/libs/hydrogen/src/xml/tinyxml.cpp
===================================================================
--- hydrogen.orig/libs/hydrogen/src/xml/tinyxml.cpp	2010-02-13 01:37:50.000000000 +0100
+++ hydrogen/libs/hydrogen/src/xml/tinyxml.cpp	2010-02-13 01:36:51.000000000 +0100
@@ -904,7 +904,7 @@
 }
 
 
-TiXmlDeclaration::TiXmlDeclaration( const char * _version,
+TiXmlDeclaration( const char * _version,
 	const char * _encoding,
 	const char * _standalone )
 : TiXmlNode( TiXmlNode::DECLARATION )