gnu: rust-lazy-static-1: Set as reference to rust-lazy-static-1.4.

* gnu/packages/crates-io.scm (rust-lazy-static-1): New variable.
(rust-arc-swap-0.3, rust-bindgen-0.50, rust-bstr-0.2,
rust-c2-chacha-0.2, rust-clap-2, rust-clicolors-control-1.0,
rust-console-0.7, rust-criterion-0.2, rust-crossbeam-epoch-0.8,
rust-crossbeam-epoch-0.7, rust-crossbeam-utils-0.7,
rust-crossbeam-utils-0.6, rust-docopt-1.1, rust-encode-unicode-0.3,
rust-findshlibs-0.5, rust-flame-0.2, rust-getrandom-0.1,
rust-grep-cli-0.1, rust-hashbrown-0.5, rust-ignore-0.4,
rust-indexmap-1.0, rust-insta-0.8, rust-nix-0.15, rust-nix-0.14,
rust-nom-4.2, rust-odds-0.3, rust-once-cell-1.2, rust-openssl-0.10,
rust-ordermap-0.3, rust-parking-lot-0.9, rust-parking-lot-0.8,
rust-parking-lot-0.7, rust-proptest-0.9, rust-pulldown-cmark-0.4,
rust-rayon-1.3, rust-rayon-1.1, rust-rayon-core-1.7,
rust-rayon-core-1.5, rust-regex-1.3, rust-regex-1.1, rust-regex-0.2,
rust-regex-automata-0.1, rust-schannel-0.1, rust-scoped-threadpool-0.1,
rust-string-cache-0.7, rust-thread-local-1.0, rust-thread-local-0.3,
rust-tokio-process-0.2, rust-tokio-reactor-0.1,
rust-tokio-trace-core-0.2, rust-try-build-1.0, rust-ucd-parse-0.1,
rust-wasm-bindegen-backend-0.2, rust-wasm-bindgen-futures-0.3): Use
rust-lazy-static-1.
* gnu/packages/rust-apps.scm (exa, fd, ripgrep, tokei): Same.
* gnu/packages/gnome.scm (librsvg-next-source): Same.

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