Add some C++17 items to gcc-6/changes.html

[Jonathan Wakely]

On 06/04/16 10:02 -0400, Jason Merrill wrote:
>On 04/04/2016 06:22 AM, Jonathan Wakely wrote:
>>I plan to commit this to wwwdocs CVS. Have I missed anything that
>>should be listed?
>
>I'd mention that TM requires the -fgnu-tm flag.

Done, the attached patch is what I committed.


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