block-padding+inout: remove `std` feature (#1117) #1731

Job	Run time
build (1.81.0, thumbv7em-none-eabi)	13s
build (1.81.0, wasm32-unknown-unknown)	14s
build (stable, thumbv7em-none-eabi)	7s
build (stable, wasm32-unknown-unknown)	15s
test (1.81.0)	25s
test (stable)	12s
minimal-versions / minimal-versions	35s
	2m 1s

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