Fail early on non Linux systems
Fail early on non Linux systems

andrei987/services,mozilla-releng/services,La0/mozilla-relengapi,garbas/mozilla-releng-services,lundjordan/services,mozilla-releng/services,mozilla-releng/services,andrei987/services,lundjordan/services,garbas/mozilla-releng-services,lundjordan/services,La0/mozilla-relengapi,srfraser/services,La0/mozilla-relengapi,andrei987/services,garbas/mozilla-releng-services,srfraser/services,srfraser/services,andrei987/services,garbas/mozilla-releng-services,mozilla-releng/services,lundjordan/services,srfraser/services,La0/mozilla-relengapi