Merge r257888, r258049 from head:

  - Use system libiconv, instead of trying to dlopen() it.
  - Just disable recoding support in libsmb if built WITHOUT_ICONV.

PR:		183153
Approved by:	re (kib)
Merge r257945 from head:

  Do not use just freed memory.

Approved by:	re (kib)
Merge r257996,r258001,r258069 from head: fixes for HyperV guest.

- Set description string for VM_GUEST_HV (HyperV guest).
- Add a brief comment about VM_GUEST and vm_guest_sysctl_names relationship.
- CTASSERT that vm_guest range is covered by vm_guest_sysctl_names.

Approved by:	re (glebius)