make "git annex help options" work outside a git repo

Option parsing for commands that run outside git repos is still screwy,
as there is no Annex monad and so the flags cannot be passed in. But,
any remaining parameters can be, which is enough for this fix.

Command/XMPPGit.hs

@@ -12,7 +12,7 @@ import Command
 import Assistant.XMPP.Git
 
 def :: [Command]
-def = [noCommit $ noRepo xmppGitRelay $ dontCheck repoExists $
+def = [noCommit $ noRepo startNoRepo $ dontCheck repoExists $
 	command "xmppgit" paramNothing seek
 		SectionPlumbing "git to XMPP relay"]
 
@@ -25,6 +25,9 @@ start _ = do
 	liftIO xmppGitRelay
 	stop
 
+startNoRepo :: CmdParams -> IO ()
+startNoRepo _ = xmppGitRelay
+
 {- A basic implementation of the git-remote-helpers protocol. -}
 gitRemoteHelper :: IO ()
 gitRemoteHelper = do