Implement more complete backend selection #1882

Job	Run time
build-freebsd-master	0s
build-freebsd-stable	0s
build-all-features (ubuntu-latest, x86_64-unknown-linux-gnu)	8m 8s
build-linux-master	0s
build-all-features (windows-latest, x86_64-pc-windows-msvc)	18m 31s
build-linux-pr (dev, x86_64-unknown-linux-gnu)	9m 29s
build-linux-stable	0s
build-linux-pr (dev, armv7-unknown-linux-gnueabihf)	3m 49s
build-macos-aarch64 (dev, aarch64-apple-darwin)	11m 39s
build-macos-x86_64 (dev, x86_64-apple-darwin)	12m 25s
build-linux-pr (dev, aarch64-linux-android)	3m 49s
build-macos-aarch64 (release, aarch64-apple-darwin)	5m 20s
build-macos-x86_64 (release, x86_64-apple-darwin)	9m 32s
build-linux-pr (release, x86_64-unknown-linux-gnu)	5m 21s
build-windows-master	0s
build-linux-pr (release, armv7-unknown-linux-gnueabihf)	4m 53s
build-linux-pr (release, aarch64-linux-android)	4m 51s
build-windows-pr (dev, x86_64-pc-windows-msvc)	20m 50s
build-windows-stable	0s
check	16s
build-windows-pr (dev, aarch64-pc-windows-msvc)	16m 16s
doc	7s
build-windows-pr (dev, x86_64-pc-windows-gnu)	8m 58s
build-windows-pr (release, x86_64-pc-windows-msvc)	8m 21s
build-windows-pr (release, aarch64-pc-windows-msvc)	7m 2s
build-windows-pr (release, x86_64-pc-windows-gnu)	9m 38s
conclusion	1s
	2h 49m 16s

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