Modify wlanstats to now use the copy of libbsdstat in /usr/lib/private.
Remove these; they're no longer required.
Let __bt_put() accept the R_SETCURSOR flag, as stated in the dbopen(3) manpage.

While here, update the comment above with all the accepted flags.

Reviewed by:	silence on hackers@
MFC after:	2 weeks
Migrate athaggrstats to use bsdstat.
Fix a compiler warning.

Thanks Clang!
Migrate athstats to use bsdstat.
Migrate mwlstats to use bsdstat.
Fix compiler warning. Thanks clang!
Migrate npestats to use bsdstat.