Revert "Fix `--mutually-exclusive-features` containing optional deps … #3423

Job	Run time
test (1.26)	7m 6s
test (stable)	3m 42s
test (no rustup)	1m 59s
test (1.30)	5m 12s
test (beta)	3m 38s
test (1.31)	5m 12s
test (nightly)	3m 39s
test (1.36)	6m 1s
test (nightly, macos-latest)	3m 39s
release-dry-run / prepare	3s
test (1.39)	5m 59s
test (nightly, windows-latest)	5m 15s
test (1.41)	5m 50s
tidy / prepare	5s
miri / miri	53s
msrv / prepare	4s
release-dry-run / build (aarch64-unknown-linux-gnu, ubuntu-22.04)	1m 11s
release-dry-run / build (aarch64-unknown-linux-musl)	1m 9s
release-dry-run / build (aarch64-apple-darwin, macos-13)	1m 23s
release-dry-run / build (aarch64-pc-windows-msvc, windows-2019)	1m 55s
release-dry-run / build (x86_64-unknown-linux-gnu, ubuntu-22.04)	44s
release-dry-run / build (x86_64-unknown-linux-musl)	53s
release-dry-run / build (x86_64-apple-darwin, macos-13)	1m 17s
release-dry-run / build (x86_64-pc-windows-msvc, windows-2019)	2m 3s
release-dry-run / build (x86_64-unknown-freebsd)	1m 17s
release-dry-run / build (x86_64-unknown-illumos)	58s
release-dry-run / build (universal-apple-darwin, macos-13)	1m 43s
msrv / build (ubuntu-latest)	5m 54s
msrv / build (windows-latest)	7m 56s
tidy / tidy	1m 10s
tidy / clippy	19s
tidy / check-external-types	0s
tidy / codegen	0s
tidy / deny	14s
tidy / docs	0s
	1h 28m 23s

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