Add atomic lib to arm-unknown-linux-gnueabihf #379

Job	Run time
Rustfmt	8s
Test (x86_64-unknown-linux-gnu, stable, ubuntu-latest)	6m 27s
Test (x86_64-unknown-linux-gnu, beta, ubuntu-latest)	7m 57s
Test (x86_64-unknown-linux-gnu, nightly, ubuntu-latest)	6m 29s
Test (x86_64-apple-darwin, stable, macos-latest)	7m 54s
Test (aarch64-apple-darwin, nightly, macos-latest)	7m 36s
Test (i686-unknown-linux-gnu, stable, ubuntu-latest)	4m 49s
Test (arm-unknown-linux-gnueabi, stable, ubuntu-latest)	4m 42s
Test (arm-unknown-linux-gnueabihf, stable, ubuntu-latest)	1m 42s
Test (aarch64-unknown-linux-gnu, stable, ubuntu-latest)	4m 32s
Test (x86_64-unknown-linux-musl, stable, ubuntu-latest)	3m 22s
Test (x86_64-pc-windows-gnu, stable, ubuntu-latest)	4m 28s
Test (wasm32-wasi, stable, ubuntu-latest)	5m 30s
Test (i686-pc-windows-msvc, stable-i686-msvc, windows-2019)	23m 30s
Test (i686-pc-windows-msvc, stable-i686-msvc, windows-2019, yes)	18m 16s
Test (x86_64-pc-windows-msvc, stable-x86_64-msvc, windows-latest)	20m 34s
Test (x86_64-pc-windows-msvc, stable-x86_64-msvc, windows-latest, yes)	25m 36s
Test (x86_64-pc-windows-msvc, stable-x86_64-msvc, windows-latest, installed)	21m 42s
	2h 55m 14s

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