cpplib: fix -Wtrigraphs double warnings

[Richard Henderson]

On Wed, Nov 22, 2000 at 08:15:42PM +0000, Neil Booth wrote:
> +      else if (buffer->cur != buffer->last_Wtrigraphs)
> +	{
> +	  buffer->last_Wtrigraphs = buffer->cur;

Don't you need to clear that somewhere too?  When
read new bits into the buffer for instance?


r~