Got Penguin sample running under Windows.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@1362 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

utils/glcanvas/samples/penguin/lw.h

@@ -49,6 +49,9 @@ typedef struct {
 
 } lwObject;
 
+#ifdef __cplusplus
+extern "C" {
+#endif
 
 int       lw_is_lwobject(const char     *lw_file);
 lwObject *lw_object_read(const char     *lw_file);
@@ -58,5 +61,9 @@ void      lw_object_show(const lwObject *lw_object);
 GLfloat   lw_object_radius(const lwObject *lw_object);
 void      lw_object_scale (lwObject *lw_object, GLfloat scale);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* LW_H */