Upstream: unmount snapshots before destroying them on macOS

Add function zfs_destroy_snaps_nvl_os() call. The main issue is that
macOS needs to unmount any mounted snapshots before they can be
destroyed. Other platforms can handle this in the kernel, but sending
a storm of zed events to unmount seems undesirable when we can do it
in userland to start with.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: John Kennedy <john.kennedy@delphix.com>
Signed-off-by: Jorgen Lundman <lundman@lundman.net>
Co-authored-by: ilovezfs <ilovezfs@icloud.com>
Closes #12550

lib/libzfs/os/linux/libzfs_util_os.c

@@ -184,6 +184,12 @@ find_shares_object(differ_info_t *di)
 	return (0);
 }
 
+int
+zfs_destroy_snaps_nvl_os(libzfs_handle_t *hdl, nvlist_t *snaps)
+{
+	return (0);
+}
+
 /*
  * Fill given version buffer with zfs kernel version read from ZFS_SYSFS_DIR
  * Returns 0 on success, and -1 on error (with errno set)