gnu: Remove rust-num-cpus-1.10.
* gnu/packages/rust-apps.scm (ripgrep)[arguments]: Replace rust-num-cpus-1.10 with 1.11.
* gnu/packages/crates-io.scm
(rust-crossbeam-channel-0.4, rust-crossbeam-channel-0.3,
rust-futures-executor-preview-0.3, rust-hyper-0.12,
rust-jobserver-0.1, rust-tokio-0.2)[arguments]: Likewise.
(rust-gimli-0.18, rust-tokio-core-0.1,
rust-tokio-io-pool-0.1, rust-tokio-reactor-0.1)[arguments]: Likewise; don't skip build.
(rust-tokio-0.1): Don't skip build. Replace rust-num-cpus-1.10 with 1.11,
rust-env-logger-0.6 with 0.5.
(rust-tokio-threadpool-0.1)[arguments]: Don't skip build. Replace
rust-num-cpus-1.10 with 1.11, rust-rand-0.4 with 0.6,
rust-env-logger-0.6 with 0.5. Add rust-lazy-static-1.
(rust-num-cpus-1.10): Remove variable.
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