feat: Support linux target in the qtox build scripts. #517

Job	Run time
build (alpine-s390x)	19s
build (bazel)	49s
build (compcert)	16s
build (doxygen)	14s
buildfarm (server)	9s
build (flutter-web)	21s
buildfarm (worker)	14s
build (frama-c)	21s
build (freebsd)	21s
build (haskell)	13s
qtox-host-qt (6.2.4)	22s
build (pkgsrc)	14s
qtox-host-qt (6.8.1)	15s
qtox-android (armeabi-v7a, debug, 6.2.4)	5s
qtox-android (armeabi-v7a, debug, 6.8.1)	3s
qtox (alpine)	8s
qtox-android (armeabi-v7a, release, 6.2.4)	4s
qtox (alpine-appimage)	5s
qtox (alpine-static)	3s
qtox-android (armeabi-v7a, release, 6.8.1)	4s
qtox (debian)	2s
qtox-android (arm64-v8a, debug, 6.2.4)	5s
qtox (fedora)	4s
qtox-android (arm64-v8a, debug, 6.8.1)	5s
qtox (flatpak-builder)	7s
qtox-android (arm64-v8a, release, 6.2.4)	6s
qtox (ubuntu-lts)	6s
qtox-android (arm64-v8a, release, 6.8.1)	4s
qtox (windows-builder.i686)	3s
qtox (windows-builder.x86_64)	4s
	5m 26s

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