Rust

Merge pull request #388 from mstange/fix-android-reuse-threads #1291

Job	Run time
windows aarch64 (aarch64-pc-windows-msvc)	3m 29s
cross (aarch64-unknown-linux-gnu)	3m 47s
build & test (x86_64-unknown-linux-gnu)	2m 17s
cross (aarch64-linux-android)	3m 46s
format	5s
build & test (x86_64-unknown-linux-musl)	2m 21s
build & test (aarch64-apple-darwin)	1m 58s
build & test (x86_64-apple-darwin)	1m 58s
build & test (x86_64-pc-windows-msvc)	6m 35s
	26m 16s

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