vendor.conf: Bump golang.org/x/sys to a55a76086885b80f79961eacb876ebd8caf3868d

With:

  $ go get -u github.com/LK4D4/vndr
  $ sed -i 's/9a7256cb28ed514b4e1e5f68959914c4c28a92e0/a55a76086885b80f79961eacb876ebd8caf3868d/' vendor.conf
  $ vndr

I'm not sure why vndr is messing with github.com/golang/protobuf, but
I assume it knows what it's doing.

The x/sys bumps to master, but I need it for MS_LAZYTIME (added in
github.com/golang/sys@ea9bcade75, unix: generate all Linux go files
from source, 2017-03-08).

Signed-off-by: W. Trevor King <[email protected]>

Author: wking

vendor.conf

@@ -18,4 +18,4 @@ github.com/golang/protobuf 18c9bb3261723cd5401db4d0c9fbc5c3b6c70fe8
 github.com/docker/docker 0f5c9d301b9b1cca66b3ea0f9dec3b5317d3686d
 github.com/docker/go-units v0.2.0
 github.com/urfave/cli d53eb991652b1d438abdd34ce4bfa3ef1539108e
-golang.org/x/sys 9a7256cb28ed514b4e1e5f68959914c4c28a92e0 https://github.com/golang/sys
+golang.org/x/sys a55a76086885b80f79961eacb876ebd8caf3868d https://github.com/golang/sys