[PATCH] msvcrt: Import memmove from musl

[Piotr Caban]

On 8/21/20 9:29 PM, Paul Gofman wrote:
> Was there any reason why you excluded the latest vcruntime140 from 
> comparison? As it is newer implementation it is obvious to expect that 
> it is be better optimized for modern CPUs.

No, I must have dropped it at some point. On my system ucrtbase is newer 
than vcruntime140 (it got updated in Windows 10 1909).

Thanks,
Piotr