mesa: enable GL_ARB_program_interface_query extension

(and mark it as DONE in docs/GL3.txt + 10.6.0 relnotes)

Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Martin Peres <martin.peres@linux.intel.com>

docs/relnotes/10.6.0.html

@@ -53,6 +53,7 @@ Note: some of the new features are only available with certain drivers.
 <li>GL_ARB_uniform_buffer_object on freedreno</li>
 <li>GL_EXT_draw_buffers2 on freedreno</li>
 <li>GL_ARB_clip_control on i965</li>
+<li>GL_ARB_program_interface_query (all drivers)</li>
 </ul>
 
 <h2>Bug fixes</h2>