Add initial prototype.

3-mid/opengl/source/platform/osmesa/private/opengl-surface_profile-privvy.adb

@@ -0,0 +1,14 @@
+package body openGL.surface_Profile.privvy
+is
+
+--     function to_glx (Self : in Item'Class) return GLX.GLXFBConfig
+--     is
+--     begin
+--        return Self.glx_Config;
+--     end to_glx;
+
+
+   procedure dummy is begin null; end;
+
+
+end openGL.surface_Profile.privvy;