[Rpm-maint] [rpm-software-management/rpm] RPM+NDB doesn't implement rpmpkgSetFsync() (#288)

[Jeff Johnson]

Changing nab_SetFsync() to do the obvious (but perhaps naive) passing:
```
static void ndb_SetFSync(rpmdb rdb, int enable)
{
    struct ndbEnv_s *ndbenv = rdb->db_dbenv;
    if (ndbenv->xdb)
        rpmxdbSetFsync(ndbenv->xdb, enable);
    if (ndbenv->pkgdb)
        rpmpkgSetFsync(ndbenv->pkgdb, enable);
}
```

leads to a slight (but still minutes, not seconds) improvement in --rebuilddb performance:
```
[jbj at ji rpm]$ /usr/bin/time sudo ./rpmdb --rebuilddb --ndb
3.42user 4.01system 7:34.55elapsed 1%CPU (0avgtext+0avgdata 46952maxresident)k
97664inputs+3641232outputs (0major+520873minor)pagefuls 0swaps
```

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