Remove unnecessary config crate features #522

Job	Run time
install-cross (linux-musl)	13s
macos (stable, x86_64-apple-darwin)	34s
macos (beta, x86_64-apple-darwin)	44s
linux (stable, arm-unknown-linux-gnueabi)	1m 31s
linux (stable, armv7-unknown-linux-gnueabihf)	1m 5s
linux (stable, i686-unknown-linux-musl)	1m 16s
linux (stable, x86_64-unknown-linux-musl)	1m 13s
linux (stable, aarch64-unknown-linux-gnu)	1m 1s
linux (stable, aarch64-unknown-linux-musl)	1m 34s
linux (stable, arm-unknown-linux-gnueabihf)	1m 13s
linux (beta, arm-unknown-linux-gnueabi)	1m 20s
linux (beta, armv7-unknown-linux-gnueabihf)	1m 15s
linux (beta, i686-unknown-linux-musl)	1m 15s
linux (beta, x86_64-unknown-linux-musl)	1m 24s
linux (beta, aarch64-unknown-linux-gnu)	1m 2s
linux (beta, aarch64-unknown-linux-musl)	1m 13s
linux (beta, arm-unknown-linux-gnueabihf)	1m 19s
	19m 12s

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