Added a pragma to get round a VisualStudio warning that I couldn't fix

in any easy way.

src/osgPlugins/txp/TrPageArchive.cpp

@@ -32,6 +32,12 @@
 using namespace txp;
 using namespace osg;
 
+// disable 'this' used in base pointer initilialization..
+#if defined(WIN32) && !(defined(__CYGWIN__) || defined(__MINGW32__))
+    #pragma warning( disable : 4355 )
+#endif
+
+
 TrPageArchive::TrPageArchive()
 : trpgr_Archive()
 , parse(new TrPageParser(this))