MFC: r253707

- Set the System Identifier in the Primary Volume Descriptor to FreeBSD
  rather than NetBSD.
- Correctly set the Expiration Time in the Primary Volume Descriptor;
  according to ISO 9660 8.4.26.1 unspecified date and time are denoted
  by the digit 0 in RBP 1 to 16 but the number 0 in RBP 17. [1]
- Merge iso9660_rrip.c rev. 1.11 from NetBSD: name_len should be read
  as unsigned byte. [2]
  Note: This is according to ISO 9660 9.1.10.
- Rock Ridge TF entries should use a length of 5, because after the 4
  bytes of generic SUSP header there is one byte of flags. See typedef
  of ISO_RRIP_TF in iso9660_rrip.h. [1]

Submitted by:	Thomas Schmitt [1]
Approved by:	re (kib)
Obtained from:	NetBSD [2]
MFC: r253675

Ensure that makefs.h is included when using ufs_bswap.h so the FFS_EI macro
is picked up when defined. Previously, ffs_subr.c was always built without
support for opposite endianess as it doesn't include makefs.h on its own.

Approved by:	re (kib)