Big wxGL classes refactoring/cleanup:

1. Provide the same API, especially, but not limited to, wxGLCanvas and
   wxCLContext ctors (which were completely different in all ports)
2. Extracted common parts into wxGLCanvas/ContextBase classes
3. Deprecate the old API using implicitly created wxGLContext


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@45388 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/app.cpp

@@ -339,6 +339,11 @@ wxApp::~wxApp()
 {
     if (m_idleTag)
         g_source_remove( m_idleTag );
+
+    if (m_glFBCInfo)
+        XFree(m_glFBCInfo);
+    if (m_glVisualInfo)
+        XFree(m_glVisualInfo);
 }
 
 bool wxApp::OnInitGui()