drop unused dep or make them optional #1906

Job	Run time
build-windows-pr (dev, x86_64-pc-windows-msvc)	19m 39s
build-linux-pr (dev, x86_64-unknown-linux-gnu)	9m 25s
build-windows-pr (dev, aarch64-pc-windows-msvc)	14m 27s
build-linux-pr (dev, armv7-unknown-linux-gnueabihf)	3m 27s
build-freebsd-master	0s
build-windows-pr (dev, x86_64-pc-windows-gnu)	9m 7s
build-all-features (ubuntu-latest, x86_64-unknown-linux-gnu)	7m 8s
build-linux-pr (dev, aarch64-linux-android)	3m 20s
build-all-features (windows-latest, x86_64-pc-windows-msvc)	18m 21s
build-windows-pr (release, x86_64-pc-windows-msvc)	7m 34s
build-linux-pr (release, x86_64-unknown-linux-gnu)	6m 12s
build-linux-pr (release, armv7-unknown-linux-gnueabihf)	4m 46s
build-freebsd-stable	0s
build-linux-master	0s
build-linux-pr (release, aarch64-linux-android)	4m 38s
build-windows-pr (release, aarch64-pc-windows-msvc)	8m 19s
build-linux-stable	0s
build-windows-pr (release, x86_64-pc-windows-gnu)	10m 9s
build-macos-aarch64 (dev, aarch64-apple-darwin)	11m 9s
build-macos-x86_64 (dev, x86_64-apple-darwin)	13m 3s
build-macos-aarch64 (release, aarch64-apple-darwin)	3m 42s
build-macos-x86_64 (release, x86_64-apple-darwin)	7m 2s
build-windows-stable	0s
build-windows-master	0s
check	19s
doc	5s
conclusion	1s
	2h 41m 53s

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