[PATCH] Define 3-argument overloads of std::hypot for C++17 (P0030R1)

[Jonathan Wakely]

On 28/09/16 09:53 -0400, Ed Smith-Rowland wrote:
>I was working on this and will pick up *PR77776* 
><https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77776>

Excellent, thanks!