Add initial prototype.

3-mid/opengl/source/platform/egl/private/opengl-surface_profile-privvy.ads

@@ -0,0 +1,10 @@
+with
+     eGL;
+
+
+package opengl.surface_Profile.privvy
+is
+
+   function to_eGL (Self : in surface_Profile.Item'Class) return egl.EGLConfig;
+
+end opengl.surface_Profile.privvy;