Merge pull request #59 from japaric/fix-hpke-rs-rust-crypto-all-features #250

Job	Run time
build (macos-11)	8m 56s
build (ubuntu-latest)	2m 43s
build (windows-latest)	4m 40s
cross-build (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	32s
fuzz (macos-11)	2m 23s
cross-build (wasm32-unknown-unknown, stable)	26s
fuzz (ubuntu-latest)	1m 5s
cross-build (aarch64-linux-android, stable)	28s
cross-build (aarch64-apple-ios, stable)	24s
no-std-check	21s
	21m 58s

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