[patch] Fix PR c++/9278

[Nathan Sidwell]

Volker Reichelt wrote:
> The C++ frontend fails to diagnose invalid code like the following:
> 
>   typedef void VOID;
>   int foo(VOID);
> 
> The patch below fixes this by not allowing typedef-names for 'void'
> in parameter lists.
> 
> Bootstrapped and regtested on i686-pc-linux-gnu.
> Ok for mainline?
ok

> What about the 4.1 branch?
no.  It's not a regression and it's a minor std conformance issue.

nathan

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