Cross compile for MAC was broken for BDB 6.2.32
Zcoin is using also using 6.2. Relevant lines were copied from:
https://github.com/zcash/zcash/blob/master/depends/packages/bdb.mk
these lines:
sed -i.old 's/WinIoCtl.h/winioctl.h/g' src/dbinc/win_db.h &&
sed -i.old 's/__atomic_compare_exchange(/__atomic_compare_exchange_db(/' src/dbinc/atomic.h &&
sed -i.old 's/atomic_init/atomic_init_db/' src/dbinc/atomic.h src/mp/mp_region.c src/mp/mp_mvcc.c src/mp/mp_fget.c src/mutex/mut_method.c src/mutex/mut_tas.c
Newer mingw supports the features necessary to enable this api, whereas older
versions didn't. However once enabled (automatically by configure), it triggers
an unrelated build bug.
Since it was not enabled previously anyway, and we don't depend on the
functionality, just disable it across the board.
