C++11 code in the gcc 10 branch

[Iain Sandoe]

FX <fxcoudert@gmail.com> wrote:

>> If Richard approves the second patch (and you’re stuck for time) - then  
>> send me the patch(es) as attachments with the commit credits you want,  
>> and I can apply them for you.
>
> Both patches only needed on gcc-10, if you can commit that’s great, many  
> thanks.

bootstrapped / smoke tested on aarch64-linux-gnu and x86_64-darwin,
pushed as r10-9187 and r10-9188.
Iain