fpta: use `MDBX_ACCEDE` for DB opening.
fpta: use `MDBX_ACCEDE` for DB opening.

MDBX_ACCEDE = using database which already opened by another process(es).

   The MDBX_ACCEDE flag avoid MDBX_INCOMPATIBLE error while
opening If the database is already used by another process(es)
and environment mode/flags isn't compatible. In such cases,
when using the MDBX_ACCEDE flag, instead of the specified
incompatible options, the mode in which the database is already
opened by other processes will be used, including
MDBX_LIFORECLAIM, MDBX_COALESCE and MDBX_NORDAHEAD. The
MDBX_ACCEDE flag is useful to open a database that already used
by another process(es) and used mode/flags isn't known.

   MDBX_ACCEDE has no effect if the current process is the only
one either opening the DB in read-only mode or other
process(es) uses the DB in read-only mode.

leo-yuriev/libfpta,leo-yuriev/libfpta