mesa: add ARB_texture_swizzle as alias of EXT_texture_swizzle, update relnotes

The specifications are identical.

docs/relnotes-7.9.html

@@ -35,6 +35,7 @@ tbd
 <h2>New features</h2>
 <ul>
 <li>GL_EXT_timer_query extension (i965 driver only)
+<li>GL_ARB_texture_swizzle extension (alias of GL_EXT_texture_swizzle)
 </ul>
 
 

src/mesa/main/extensions.c

@@ -84,6 +84,7 @@ static const struct {
    { OFF, "GL_ARB_texture_mirrored_repeat",    F(ARB_texture_mirrored_repeat)},
    { OFF, "GL_ARB_texture_non_power_of_two",   F(ARB_texture_non_power_of_two)},
    { OFF, "GL_ARB_texture_rectangle",          F(NV_texture_rectangle) },
+   { OFF, "GL_ARB_texture_swizzle",            F(EXT_texture_swizzle) },
    { ON,  "GL_ARB_transpose_matrix",           F(ARB_transpose_matrix) },
    { OFF, "GL_ARB_transform_feedback2",        F(ARB_transform_feedback2) },
    { OFF, "GL_ARB_vertex_array_bgra",          F(EXT_vertex_array_bgra) },