block-padding+inout: remove `std` feature (#1117) #1719

Job	Run time
build (1.81.0, thumbv7em-none-eabi)	13s
build (1.81.0, wasm32-unknown-unknown)	18s
build (stable, thumbv7em-none-eabi)	16s
build (stable, wasm32-unknown-unknown)	16s
test (1.81.0)	13s
test (stable)	6s
minimal-versions / minimal-versions	25s
	1m 47s

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