Rust

Replace RwLock with RefCell in thread_local #3

Job	Run time
Check wasm32 + wasm-bindgen	4m 31s
android	31s
Format + check + test	9m 18s
cargo-deny aarch64-apple-darwin	57s
cargo-deny aarch64-linux-android	59s
Check Windows	2m 59s
cargo-deny i686-pc-windows-gnu	53s
cargo-deny i686-pc-windows-msvc	55s
cargo-deny i686-unknown-linux-gnu	48s
cargo-deny wasm32-unknown-unknown	54s
cargo-deny x86_64-apple-darwin	49s
cargo-deny x86_64-pc-windows-gnu	53s
cargo-deny x86_64-pc-windows-msvc	58s
cargo-deny x86_64-unknown-linux-gnu	53s
cargo-deny x86_64-unknown-linux-musl	43s
cargo-deny x86_64-unknown-redox	56s
	27m 57s

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