Log Message:
samba4: updated to 4.13.4

Changes 4.13.4
* BUG 14607: Work around special SMB2 IOCTL response behavior of NetApp Ontap
  7.3.7.
* BUG 14612: Temporary DFS share setup doesn't set case parameters in the
  same way as a regular share definition does.
* BUG 14605: lib: Avoid declaring zero-length VLAs in various messaging
  functions.
* BUG 14579: Do not create an empty DB when accessing a sam.ldb.
* BUG 14596: vfs_fruit may close wrong backend fd.
* BUG 14612: Temporary DFS share setup doesn't set case parameters in the
  same way as a regular share definition does.
* BUG 14606: vfs_virusfilter: Allocate separate memory for config char*.
* BUG 14596: vfs_fruit may close wrong backend fd.
* BUG 14607: Work around special SMB2 IOCTL response behavior of NetApp Ontap
  7.3.7.
* BUG 14601: The cache directory for the user gencache should be created
  recursively.
* BUG 14594: Be more flexible with repository names in CentOS 8 test
  environments.