mdbx: backport - allow mdbx_env_compact() to fix page leaks.
mdbx: backport - allow mdbx_env_compact() to fix page leaks.

Don't treat fixing page leaks as an error while copy DB with compactification.

Change-Id: I2a575ff9e2b24610172aaca939b5f6957c26ec77

leo-yuriev/libfpta,leo-yuriev/libfpta