*** PATCH KNOWN, WILL FOLLOW ***

Some combination or other of missing or disabled debug options can lead to
the video4linux plugin being compiled WITHOUT the macro GST_DISABLE_GST_DEBUG
being defined (it happened to me).
The debugging function gst_v4lsrc_palette_name() is still unconditionally
included in the code, but it tries to refer to the array v4l_palette_name[], 
which is conditionally excluded.

This was in the code last time I built the plugins, several releases ago,
though I was too shy to submit a patch.  I'm a bit boggled that nobody
else has run into it!  My 'configure' options are really not strange at all.

The patch comes next.
I've simply returned a dummy name if the array isn't
available.  This is certainly safe, if a bit lazy on my part (ideally I
should check whether I really need the function at all).  However, the
cost of retaining the useless stub is so tiny that I can't be bothered
to see whether removing it breaks anything.