Refactor Apple flags #36

Job	Run time
Clippy	26s
Test build-std (aarch64-tvos)	2m 40s
Test build-std (aarch64-tvos-sim)	2m 8s
MSRV (ubuntu-latest)	27s
Test CUDA support	1m 37s
Test build-std (x86_64-tvos)	2m 14s
Test wasm (wasm32-unknown-unknown)	16s
MSRV (windows-latest)	42s
MSRV (macos-latest)	39s
Rustfmt	7s
semver-checks	2m 27s
Test (stable)	1m 19s
Test wasm32-wasip1-thread	29s
Test (beta)	1m 19s
Test (nightly)	2m 1s
Test (linux32)	2m 11s
Test (macos)	4m 51s
Test (aarch64-macos)	1m 19s
Test (aarch64-ios)	1m 54s
Test (win32)	2m 4s
Test (win64)	2m 37s
Test (mingw32)	2m 39s
Test (mingw64)	2m 31s
Test (windows-2019)	2m 58s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	3m 37s
Test (windows-clang, windows-2019, stable, x86_64-pc-windows-msvc, clang, clang++)	4m 26s
Test (windows-clang-cl, windows-2019, stable, x86_64-pc-windows-msvc, clang-cl, clang-cl)	4m 15s
	54m 13s

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