mesa: Fix display list handling for GL_EXT_framebuffer_multisample.

mesa: Fix display list handling for GL_EXT_framebuffer_multisample.

From the extension spec:

    Added to section 5.4, as part of the discussion of which commands
    are not compiled into display lists:

    "Certain commands, when called while compiling a display list, are
    not compiled into the display list but are executed immediately.
    These are: ..., RenderbufferStorageMultisampleEXT..."

Fixes piglit EXT_framebuffer_multisample/dlist.

Reviewed-by: Brian Paul <brianp@vmware.com>
(cherry picked from commit 3d8c27f882b852ada86aac99a54fdb57d98a79ac)