Remove no_NO (only use nb_NO and nn_NO)

Remove no_NO (only use nb_NO and nn_NO)

There are only two variations of Norwegian: Bokmål or nynorsk, both of
which are equally official.  These are established by law and governmental
policy:  Bokmål (literally "book language") and Nynorsk (literally "new
Norwegian").  The Norwegian Language Council recommends the terms
"Newegian Bokmål" and "Norwegian Nynorsk" in English.

The no_NO variant is a holdover from when nb_NO and nn_NO were created.
In glibc, the old no_NO was kept as an alias to nb_NO.  This option is
considered confusing and probably should have been removed years ago.