misc/vim: use shiftwidth() instead of &sw if available. Fixes issue 6841.
misc/vim: use shiftwidth() instead of &sw if available.
Fixes issue 6841.

R=golang-dev, dsymonds
CC=golang-dev
https://codereview.appspot.com/43010044

h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang