Dropping HAL support from gvfs

[Michael Biebl <mbiebl gmail com>]

Hi,

in [1] I posted a patch, which drops the HAL code inside gvfs.
HAL has been dead for many years. Throughout the GNOME stack HAL
support has been removed, only exception is gvfs.
I think we should do the same for gvfs, as this simplifies the gphoto2
and cdda backends quite a bit. Atm the code is quite hard to read with
all the #ifdefs.
I'm also not sure, if the HAL code is actually still working.

Ondrej Holy, one of the gvfs developers, also wanted to know, if there
are plattforms around, that still require this code.

Please speak up now, if you would be affected by this.

Regards,
Michael

[1] https://bugzilla.gnome.org/show_bug.cgi?id=770671
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