vere: lmdb: wrap mdb_strerror in mdb_logerror
vere: lmdb: wrap mdb_strerror in mdb_logerror

To avoid allocating a buffer on MingW, mdb_strerror uses a horrible
stack hack which explodes in vere. Source patch replaces it with mdb_logerror
on MingW. This change adds the default implementation for other platforms.

ngzax/urbit,ngzax/urbit,urbit/urbit,urbit/urbit,urbit/urbit,urbit/urbit,ngzax/urbit,ngzax/urbit,urbit/urbit,ngzax/urbit,ngzax/urbit,ngzax/urbit,urbit/urbit,urbit/urbit