CI: fix belt-dwp build (#702) #74

Job	Run time
build (1.85.0, armv7a-none-eabi)	15s
build (1.85.0, thumbv7em-none-eabi)	14s
benches	15s
build (stable, thumbv7em-none-eabi)	15s
build (1.85.0, wasm32-unknown-unknown)	17s
build (stable, armv7a-none-eabi)	9s
test (x86_64-unknown-linux-gnu, stable)	16s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	31s
test (i686-unknown-linux-gnu, 1.85.0, sudo apt update && sudo apt install gcc-multilib)	43s
test (x86_64-unknown-linux-gnu, 1.85.0)	21s
build (stable, wasm32-unknown-unknown)	14s
	3m 30s

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