ABI/architecture identification for packages

[Vitaly Magerya]

Baptiste Daroussin wrote:
> when a package can be installed in both i386 and amd64
> 
> and maybe in the Makefile:
> 
> PKGARCH=	i386 amd64
> 
> or
> 
> PKGARCH=	x86:32 x86:64

Baptiste, if ABI/arch ids will leak out to port Makefiles (i.e. I will
need to care about them), then please leave them matching to the usual
FreeBSD arch names, i.e. i386 and amd64, not the new ones. For reasons
of consistency.