[gtkada] Patch: Install complete sources of TestGTK.

[Nicolas Setton]

Hello Björn,

> "make install" doesn't install the complete source code of TestGTK. The
> subdirectory opengl is missing. Main_Windows requires View_GL even when
> OpenGL support is disabled.
> 
> Here's a patch to install the missing source files. It's meant to be
> applied after the "directories" patch.

Thank you for the patch!

We have already fixed this in the development branch (in another manner: we have switched to using the "gprinstall" tool to install GtkAda and testgtk).

Nicolas