cmov

Only run CI on latest commit of PR branches. #685

Job	Run time
build (stable, wasm32-unknown-unknown)	1s
minimal-versions / minimal-versions	1s
build (1.85.0, thumbv7em-none-eabi)	25s
test (x86_64-pc-windows-msvc, windows-latest, 1.85.0)	1s
cross (aarch64-unknown-linux-gnu, stable)	1s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.85.0)	1s
build (1.85.0, wasm32-unknown-unknown)	1s
test (x86_64-apple-darwin, macos-latest, 1.85.0)	1s
build (stable, thumbv7em-none-eabi)	1s
cross (aarch64-unknown-linux-gnu, 1.85.0)	25s
cross (powerpc-unknown-linux-gnu, 1.85.0)	1s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.85.0, sudo apt update && sudo apt install gcc-mult...	25s
cross (powerpc-unknown-linux-gnu, stable)	1s
	1m 25s

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