amd64 port completely crossbuildable on NetBSD

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amd64 port completely crossbuildable on NetBSD
NetBSD's Frank van der Linden announced that he has added gdb support to the tree, as a result the NetBSD/amd64 port is now completely crossbuildable. NetBSD/amd64 is a port to the AMD64 family of processors. It was first committed to the NetBSD source tree as NetBSD/x86_64 in June, 2001 and renamed to NetBSD/amd64 on April, 2003. Frank van der Linden is the maintainer of this port (with AMD providing him with hardware).