Hello, Automakers!

My last patch for now, this time for 
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=20077:

- if $(V) is empty, use default verbosity,
- if $(V) = 0, be silent,
- if $(V) is neither empty nor 0, be verbose (not only with V=1, but 
e.g. V=99).

Yes, requires some shell, but just like other stuff.

Note that this just switches verbosity off and on, doesn't pay any 
attention if the user would want e.g. more verbosity with V=99 than 
with V=1.

Regards,
Bogdan Drozdowski


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