Added support for glLineWidth via an osg::LineWidth StateAttribute.

src/osg/LineWidth.cpp

@@ -0,0 +1,27 @@
+#include <osg/GL>
+#include <osg/LineWidth>
+#include <osg/Notify>
+
+using namespace osg;
+
+
+LineWidth::LineWidth()
+{
+    _width = 1.0f;
+}
+
+
+LineWidth::~LineWidth()
+{
+}
+
+void LineWidth::setWidth( const float width )
+{
+    _width = width;
+}
+
+void LineWidth::apply(State&) const
+{
+    glLineWidth(_width);
+}
+