ci: rework Linux build scripts, allow crosscompiling with whatever is… #2458

Job	Run time
flatpak (su.xash.Engine.Compat.i386)	3m 31s
build (ubuntu-20.04, linux, amd64)	2m 43s
build (ubuntu-20.04, linux, i386)	3m 3s
build (ubuntu-20.04, linux, arm64, true)	3m 46s
build (ubuntu-20.04, linux, armhf, true)	3m 16s
build (ubuntu-20.04, linux, riscv64, true)	3m 12s
build (ubuntu-20.04, linux, ppc64el, true)	3m 58s
build (ubuntu-20.04, android, multiarch)	5m 39s
build (ubuntu-latest, nswitch, arm64)	3m 19s
build (ubuntu-latest, psvita, armv7hf)	5m 38s
build (windows-latest, win32, amd64)	1m 59s
build (windows-2019, win32, i386)	2m 14s
build (macos-14, apple, arm64)	1m 43s
build (macos-12, apple, amd64)	1s
Upload releases	1s
	44m 3s

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