mdbx: set MDBX_FATAL_ERROR when mdbx_env_open() failed.
mdbx: set MDBX_FATAL_ERROR when mdbx_env_open() failed.

Change-Id: If02d670c7ce3a5dd696a87848df28ffe817c6922

leo-yuriev/libfpta,leo-yuriev/libfpta