[PATCH] nss: Remove effectively unused struct nss_database_default_cache

[Florian Weimer]

* Collin Funk:

> Looks like it was never used? At least in the commit it was introduced:
>
>     $ git diff fa78feca47fdc226b46e7f6fea4c08c10fccd182^ \
>         fa78feca47fdc226b46e7f6fea4c08c10fccd182

Yes, it comes from a very early iteration of the code.  Not sure if that
was ever posted to libc-alpha.

> Reviewed-by: Collin Funk <collin.funk1@gmail.com>

Thanks,
Florian