Add -mfloat-abi=hard as a default argument when using any arm/thumb-none-eabihf target #1817

Job	Run time
Test wasm (wasm32-unknown-unknown)	17s
Test CUDA support	54s
Clippy	27s
Test build-std (aarch64-tvos)	1m 42s
MSRV (ubuntu-latest)	26s
Rustfmt	13s
Test build-std (aarch64-tvos-sim)	1m 51s
MSRV (windows-latest)	42s
semver-checks	2m 26s
Test build-std (x86_64-tvos)	1m 56s
MSRV (macos-latest)	27s
Test (stable)	59s
Test (beta)	59s
Test (nightly)	1m 23s
Test (linux32)	1m 37s
Test (macos)	3m 18s
Test (aarch64-macos)	1m 23s
Test (aarch64-ios)	1m 16s
Test (win32)	2m 18s
Test (win64)	2m 59s
Test (mingw32)	2m 25s
Test (mingw64)	2m 26s
Test (windows-2019)	2m 58s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	1m 58s
Test (windows-clang, windows-2019, stable, x86_64-pc-windows-msvc, clang, clang++)	3m 11s
Test (windows-clang-cl, windows-2019, stable, x86_64-pc-windows-msvc, clang-cl, clang-cl)	2m 49s
	43m 20s

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