(ITS#8739) Better check for fsync on FreeBSD

Full_Name: Pietro Cerutti Version: lmdb 0.9.21 OS: FreeBSD 11.1 URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (69.191.176.33)

This patch allows for a finer-grained control over which FreeBSD versions support fdatasync. This allows us to get rid of a custom patch in our ports.

--- mdb.c.orig 2017-06-01 16:51:10 UTC +++ mdb.c @@ -125,6 +125,8 @@ typedef SSIZE_T ssize_t; # define MDB_FDATASYNC fsync #elif defined(ANDROID) # define MDB_FDATASYNC fsync +#elif defined(__FreeBSD_version) && __FreeBSD_version < 1101000 +# define MDB_FDATASYNC fsync #endif

#ifndef _WIN32