zsh_completion: Remove unused functions

shell-completion/zsh/_systemd

@@ -102,19 +102,6 @@ _ctls()
     esac
 }
 
-_hosts_or_user_at_host()
-{
-  _alternative \
-    'users-hosts:: _user_at_host' \
-    'hosts:: _hosts'
-}
-
-_outputmodes() {
-    local -a _output_opts
-    _output_opts=(short short-monotonic verbose export json json-pretty json-see cat)
-    _describe -t output 'output mode' _output_opts || compadd "$@"
-}
-
 _ctls "$@"
 
 #vim: set ft=zsh sw=4 ts=4 et