mesa/format: add mesa MESA_FORMAT_ARGB2101010_UINT support.

This format is used in the ARB_texture_rgb10_a2ui spec.

It adds core mesa support, texformat + texstore support, format_unpack
and fbobject.c (all patches from list merged + fixed up).

also fixes some whitespace issues.

Parts were:
Reviewed-by: Eric Anholt <eric@anholt.net>

Signed-off-by: Dave Airlie <airlied@redhat.com>

src/mesa/main/fbobject.c

@@ -1299,6 +1299,9 @@ _mesa_base_fbo_format(struct gl_context *ctx, GLenum internalFormat)
    case GL_LUMINANCE_ALPHA32UI_EXT:
       return ctx->Extensions.EXT_texture_integer &&
              ctx->Extensions.ARB_framebuffer_object ? GL_LUMINANCE_ALPHA : 0;
+
+   case GL_RGB10_A2UI:
+      return ctx->Extensions.ARB_texture_rgb10_a2ui ? GL_RGBA : 0;
    default:
       return 0;
    }