primeorder: add `alloc` feature (#982) #170

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	3m 46s
cross (armv7-unknown-linux-gnueabihf, 1.65.0)	4m 52s
build (1.65.0, wasm32-unknown-unknown)	3m 39s
cross (armv7-unknown-linux-gnueabihf, stable)	1m 12s
build (stable, thumbv7em-none-eabi)	14s
cross (aarch64-unknown-linux-gnu, 1.65.0)	5m 0s
build (stable, wasm32-unknown-unknown)	11s
cross (aarch64-unknown-linux-gnu, stable)	1m 13s
doc	15s
cross (powerpc-unknown-linux-gnu, 1.65.0)	4m 44s
cross (powerpc-unknown-linux-gnu, stable)	1m 21s
test (i686-unknown-linux-gnu, 1.65.0, sudo apt update && sudo apt install gcc-multilib)	4m 48s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 16s
test (x86_64-unknown-linux-gnu, 1.65.0)	4m 26s
test (x86_64-unknown-linux-gnu, stable)	1m 24s
	38m 21s

Provide feedback