Revert "Fix `--mutually-exclusive-features` containing optional deps (#261)" #3422

Job	Run time
test (stable)	3m 46s
test (no rustup)	2m 2s
test (1.26)	7m 9s
test (beta)	3m 39s
test (1.30)	5m 6s
test (nightly)	3m 47s
test (1.31)	5m 26s
test (nightly, macos-latest)	3m 12s
test (1.36)	5m 53s
test (nightly, windows-latest)	5m 53s
test (1.39)	5m 48s
test (1.41)	5m 42s
miri / miri	53s
release-dry-run / prepare	3s
msrv / prepare	3s
tidy / prepare	5s
release-dry-run / build (aarch64-unknown-linux-gnu, ubuntu-22.04)	1m 47s
release-dry-run / build (aarch64-unknown-linux-musl)	1m 10s
release-dry-run / build (aarch64-apple-darwin, macos-13)	1m 26s
release-dry-run / build (aarch64-pc-windows-msvc, windows-2019)	1m 30s
msrv / build (ubuntu-latest)	7m 51s
release-dry-run / build (x86_64-unknown-linux-gnu, ubuntu-22.04)	48s
msrv / build (windows-latest)	7m 54s
release-dry-run / build (x86_64-unknown-linux-musl)	52s
release-dry-run / build (x86_64-apple-darwin, macos-13)	2m 9s
release-dry-run / build (x86_64-pc-windows-msvc, windows-2019)	1m 56s
release-dry-run / build (x86_64-unknown-freebsd)	1m 16s
release-dry-run / build (x86_64-unknown-illumos)	58s
release-dry-run / build (universal-apple-darwin, macos-13)	2m 7s
tidy / tidy	1m 2s
tidy / clippy	19s
tidy / check-external-types	0s
tidy / deny	19s
tidy / codegen	0s
tidy / docs	0s
	1h 31m 51s

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