Improve clarity of some casts;
from Christos Zoulas <christos at NetBSD>.

cast off_t and uint64_t for printf(3)
to make sure that widths match on all platforms;
from Ed Maste <emaste at freebsd dot org>;
OK guenther@

st_size is off_t, which is signed, so use %lld rather than %llu;
noticed by Ed Maste when compiling on FreeBSD

less confusing warning message about negative offsets

When running into a mandoc.db(5) file still using the obsolete
format based on SQLite 3, say so in words that mortals can
understand rather than babbling about hex magic.
Suggested by espie@.

Remove the dependency on SQLite without loss of functionality.
Drop the obsolete names_check() now that we deleted MLINKS.
Run "doas makewhatis" after compiling and installing this.

Earlier version

Remove the dependency on SQLite without loss of functionality.
Drop the obsolete names_check() now that we deleted MLINKS.
Run "doas makewhatis" after compiling and installing this.

Earlier version tested by jmc@ and jturner@;
"commit it all" deraadt@ "commit and dodge" krw@

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