Make C1X anonymous structs/unions follow N1549

[Jakub Jelinek]

On Fri, Mar 18, 2011 at 09:16:55PM +0000, Joseph S. Myers wrote:
> This week's London WG14 meeting agreed to disallow the use of typedefs
> in declaring anonymous structure and union fields, as per N1549.  This
> patch implements this, restricting the use of typedefs in this case to
> -fms-extensions and -fplan9-extensions as in 4.5 and earlier releases.

If I understand it right, your patch restores the 4.5 code except for
-fplan9-extensions and with flag_iso not being checked.

I guess it is ok for 4.6.0 too.

	Jakub