Patch to deprecate the gnome_vfs_async_*_as_channel functions

[Mikael Hallendal <micke imendio com>]

Hi,

As mentioned here on the list in the past the 
gnome_vfs_async_*_as_channel API doesn't behave as intended [1], [2] and 
[3] and all functions aren't even implemented [4].

My suggestion is to deprecate them since no one seems to have noticed 
that it's totally broken (ie. no one uses them) so at least me get the 
idea that they aren't that useful.

If someone in the future has need for them they could be fixed/rewritten 
and undeprecated.

Can I commit this patch?

Best Regards,
  Mikael Hallendal

[1] http://bugzilla.gnome.org/show_bug.cgi?id=157266
[2] http://bugzilla.gnome.org/show_bug.cgi?id=157265
[3] http://bugzilla.gnome.org/show_bug.cgi?id=157261
[4] http://bugzilla.gnome.org/show_bug.cgi?id=138398

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