mesa: Remove all mention of EXT_vertex_array_set

Mesa has never any portion of this extension, and neither has any
other vendor.

Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/mesa/main/extensions.c

@@ -212,7 +212,6 @@ static const struct extension extension_table[] = {
    { "GL_EXT_transform_feedback",                  o(EXT_transform_feedback),                  GL,             2011 },
    { "GL_EXT_vertex_array_bgra",                   o(EXT_vertex_array_bgra),                   GL,             2008 },
    { "GL_EXT_vertex_array",                        o(dummy_true),                              GL,             1995 },
-   { "GL_EXT_vertex_array_set",                    o(EXT_vertex_array_set),                    GL,             1997 },
 
    /* OES extensions */
    { "GL_OES_blend_equation_separate",             o(EXT_blend_equation_separate),                  ES1,       2009 },

src/mesa/main/mtypes.h

@@ -2852,7 +2852,6 @@ struct gl_extensions
    GLboolean EXT_transform_feedback;
    GLboolean EXT_timer_query;
    GLboolean EXT_vertex_array_bgra;
-   GLboolean EXT_vertex_array_set;
    GLboolean OES_standard_derivatives;
    /* vendor extensions */
    GLboolean AMD_conservative_depth;