Makefile using cp -arf

[Lillian Angel]

Diego 'Flameeyes' Pettenò wrote:
> "Michael Franz" <mvfranz at gmail.com>
> writes:
> 
>> I am not sure, but I think that -pRf is the equivalent of -arf on Linux.
> 
> -a in GNU cp is -dpPR; -d is rarely needed, and what is requested is
>  -pPR, -pRf should be enough in most cases where -arf is used.
> 
> (I coped with a similar migration in Gentoo's ebuilds when I've started
> orking on Gentoo/FreeBSD).

Fixed.