mesa: add GL_OES_texture_border_clamp support

Only minor differences to the existing ARB_texture_border_clamp support.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>

docs/relnotes/11.3.0.html

@@ -44,6 +44,7 @@ Note: some of the new features are only available with certain drivers.
 </p>
 
 <ul>
+<li>GL_OES_texture_border_clamp and GL_EXT_texture_border_clamp on all drivers that support GL_ARB_texture_border_clamp</li>
 </ul>
 
 <h2>Bug fixes</h2>