[ref] rust 2018: remove useless extern crate

10 jobs from counter/117-counter-test-module in 9 minutes and 59 seconds (queued for 6 seconds)
Status Job ID Name Coverage
  Fmt
passed #15335
redshift-rs-stable
fmt

00:00:21

 
  Tests
manual #15337
redshift-rs-stable allowed to fail manual
tests:arm-v7-:stable
manual #15339
redshift-rs-stable allowed to fail manual
tests:linux64:beta
manual #15340
redshift-rs-nightly allowed to fail manual
tests:linux64:nightly
passed #15336
redshift-rs-stable
tests:linux64:stable

00:06:08

passed #15338
redshift-rs-stable
tests:win64:stable

00:06:43

 
  Clippy
passed #15341
redshift-rs-stable
clippy

00:02:53

 
  Package
manual #15343
redshift-rs-stable allowed to fail manual
package:test:armv7
manual #15342
redshift-rs-stable allowed to fail manual
package:test:linux64
manual #15344
redshift-rs-stable allowed to fail manual
package:test:win64