libpciaccess on DragonflyBSD 64

[Mandacarú Cascavel <mancasc%yahoo.com.br@localhost>]

I've had to change "DragonflyBSD-*-x86_64" for "DragonflyBSD-*-
amd64" in Makefile in order to successfully build sysutils/libpciaccess. 
It's a dependency for installing xorg. 

I've had to eliminate the option for dri in order to build MesaLib. 

I don't know for the moment if everything will work. The installation is 
being made inside a qemu box and isn't still complete.

Cheers
Mandacarú 
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