[PATCH] msvcrt: Import memmove from musl

[Piotr Caban]

Hi Gabriel,

I was experimenting with various attempts of implementing memmove. I'm 
attaching a modified version of Paul's test application. It compares 
memmove performance from ucrtbase, msvcr100 and msvcrt dlls. It also 
contains assembler (i386) implementation of the function.

Thanks,
Piotr
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