From Jean-Sebastien Guay, warning fixes

src/osgPlugins/cfg/ConfigLexer.cpp

@@ -9,6 +9,8 @@
 #define YY_FLEX_MAJOR_VERSION 2
 #define YY_FLEX_MINOR_VERSION 5
 
+#include <osg/Config>
+
 #if defined(_MSC_VER) && defined(OSG_DISABLE_MSVC_WARNINGS)
     // disable '=' : conversion from 'int' to 'char', possible loss of data style warnings
     #pragma warning( disable : 4244)

src/osgUtil/TriStrip_graph_array.h

@@ -79,6 +79,7 @@ public:
     class arc
     {
     public:
+        arc() {}
         arc & mark()                                    { m_Marker = true; return (* this); }
         arc & unmark()                                    { m_Marker = false; return (* this); }
         bool marked() const                                { return m_Marker; }