Add atomic lib to arm-unknown-linux-gnueabihf #381

Job	Run time
Rustfmt	11s
Test (x86_64-unknown-linux-gnu, stable, ubuntu-latest)	8m 49s
Test (x86_64-unknown-linux-gnu, beta, ubuntu-latest)	6m 26s
Test (x86_64-unknown-linux-gnu, nightly, ubuntu-latest)	6m 29s
Test (x86_64-apple-darwin, stable, macos-latest)	6m 53s
Test (aarch64-apple-darwin, nightly, macos-latest)	6m 11s
Test (i686-unknown-linux-gnu, stable, ubuntu-latest)	3m 43s
Test (arm-unknown-linux-gnueabi, stable, ubuntu-latest)	3m 58s
Test (arm-unknown-linux-gnueabihf, stable, ubuntu-latest)	2m 40s
Test (aarch64-unknown-linux-gnu, stable, ubuntu-latest)	3m 57s
Test (x86_64-unknown-linux-musl, stable, ubuntu-latest)	4m 10s
Test (x86_64-pc-windows-gnu, stable, ubuntu-latest)	4m 21s
Test (wasm32-wasi, stable, ubuntu-latest)	5m 17s
Test (i686-pc-windows-msvc, stable-i686-msvc, windows-2019)	17m 41s
Test (i686-pc-windows-msvc, stable-i686-msvc, windows-2019, yes)	18m 12s
Test (x86_64-pc-windows-msvc, stable-x86_64-msvc, windows-latest)	23m 37s
Test (x86_64-pc-windows-msvc, stable-x86_64-msvc, windows-latest, yes)	20m 7s
Test (x86_64-pc-windows-msvc, stable-x86_64-msvc, windows-latest, installed)	27m 0s
	2h 49m 42s

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