ci: rework Linux build scripts, allow crosscompiling with whatever is… #2457

Job	Run time
flatpak (su.xash.Engine.Compat.i386)	1m 17s
build (ubuntu-20.04, linux, amd64)	27s
build (ubuntu-20.04, linux, i386)	41s
build (ubuntu-20.04, linux, arm64, true)	49s
build (ubuntu-20.04, linux, armhf, true)	58s
build (ubuntu-20.04, linux, riscv64, true)	53s
build (ubuntu-20.04, linux, ppc64el, true)	34s
build (ubuntu-20.04, android, multiarch)	1m 29s
build (ubuntu-latest, nswitch, arm64)	1m 29s
build (ubuntu-latest, psvita, armv7hf)	1m 28s
build (windows-latest, win32, amd64)	1m 25s
build (windows-2019, win32, i386)	1m 22s
build (macos-14, apple, arm64)	1m 32s
build (macos-12, apple, amd64)	1s
Upload releases	1s
	14m 26s

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