Reducing make doc output

[Phil Holmes]

One of the warnings showing in make doc now is:

langdefs.py: warning: lilypond-doc gettext domain not found.

I'm not sure what to do about this.  There's no point in sending it to a 
logfile.  I'm not sure the value the warning has?  I could get rid of it?  I 
could make it depend on warning level?  Any other suggestions?

--
Phil Holmes