Use strncpy for older kernels

[RikshaDriver]

Support for compilation on older linux kernels without support for strscpy

[hcartiaux]

I don't really want to merge because it is hopeless to support all the old kernels. We would have to rebase the old patches every time realtek release a new version.

This repository is intended to support the recent kernels provided by current distributions (in my case, archlinux).

I let @wget handle this PR...