ports/76941: Patch to science/vmd: compile and run vmd on amd64 machine.

[Sangwoo Shim]

I've updated my patch for amd64 to catch up with recent vmd update.

patch against science/vmd directory can be found at
http://www.swoo.org/~sangwoo/vmd-amd64.diff

And, entire vmd ports can be downloaded at
http://www.swoo.org/~sangwoo/vmd-amd64.tar.bz2

- Sangwoo Shim