syscall: Remove obsolete Errstr call from commented-out example.
syscall: Remove obsolete Errstr call from commented-out example.

syscall_windows.go contains a small demo, which calls the obsolete
syscall.Errstr function.

R=golang-dev, alex.brainman
CC=golang-dev
http://codereview.appspot.com/5475044

Committer: Alex Brainman <54ba58c8441b5eff861de6b4e5ee46baf086b142@gmail.com>

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