Do not abort with inotify extension enabled, but not supported by the system.

And remove the "native support is required" message which is generated at an
inappropriate location and is printed more than once when using 'hg status'.

hgext/inotify/__init__.py

@@ -80,6 +80,7 b' def reposetup(ui, repo):'
                     query = None
                     ui.debug(_('(starting inotify server)\n'))
                     try:
+                        try:
                         server.start(ui, repo)
                         query = client.query
                     except server.AlreadyStartedException, inst:

hgext/inotify/server.py

@@ -15,7 +15,6 b' try:'
     import linux as inotify
     from linux import watcher
 except ImportError:
-    print >> sys.stderr, '*** native support is required for this extension'
     raise
 
 class AlreadyStartedException(Exception): pass