egl: Rename MESA_configless_context bit to KHR_no_config_context

Keep the old name in the extension string, but refer to the KHR
extension internally.

Reviewed-by: Kristian Høgsberg <krh@bitplanet.net>
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Adam Jackson <ajax@redhat.com>
diff --git a/src/egl/drivers/dri2/egl_dri2.c b/src/egl/drivers/dri2/egl_dri2.c
index 859612f..bbc457c 100644
--- a/src/egl/drivers/dri2/egl_dri2.c
+++ b/src/egl/drivers/dri2/egl_dri2.c
@@ -603,8 +603,8 @@
       disp->ClientAPIs |= EGL_OPENGL_ES3_BIT_KHR;
 
    assert(dri2_dpy->image_driver || dri2_dpy->dri2 || dri2_dpy->swrast);
+   disp->Extensions.KHR_no_config_context = EGL_TRUE;
    disp->Extensions.KHR_surfaceless_context = EGL_TRUE;
-   disp->Extensions.MESA_configless_context = EGL_TRUE;
 
    if (dri2_renderer_query_integer(dri2_dpy,
                                    __DRI2_RENDERER_HAS_FRAMEBUFFER_SRGB))