Apple: Remove redundant flags #1976

Job	Run time
Test build-std (aarch64-tvos)	1m 58s
Test (stable)	1m 23s
Test build-std (aarch64-tvos-sim)	1m 45s
Clippy	18s
Test (beta)	1m 17s
Test build-std (x86_64-tvos)	1m 47s
Test wasm (wasm32-unknown-unknown)	20s
Test (nightly)	1m 25s
Test (linux32)	2m 7s
MSRV (ubuntu-latest)	22s
Test (macos)	2m 56s
Rustfmt	10s
MSRV (windows-latest)	42s
semver-checks	15s
Test (aarch64-macos)	1m 29s
MSRV (macos-latest)	32s
Test (aarch64-ios)	47s
Test wasm32-wasip1-thread	27s
Test (win32)	1m 55s
Test (win64)	1m 39s
Test CUDA support	30s
Test (mingw32)	2m 39s
Test (mingw64)	2m 23s
Test (windows-2019)	3m 19s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	3m 44s
Test (windows-clang, windows-2019, stable, x86_64-pc-windows-msvc, clang, clang++)	5m 7s
Test (windows-clang-cl, windows-2019, stable, x86_64-pc-windows-msvc, clang-cl, clang-cl)	4m 16s
	45m 32s

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