MFC r292337, r292552, r292553:

MFC r292337, r292552, r292553:

  Build mount_smbfs for arm.  Also sort the subdirs.

  Avoid unaligned memory accesses when encoding netbios names in libsmb.

  The current code for encoding a netbios name converts each byte to a 16-bit
  value and stores the result by casting a char* to u_short*, resulting in
  alignment faults on strict-alignment platforms.

  This change reimplements the encoding routine using only byte accesses to
  memory. There is no particular reason to work with 16-bit values just
  because the encoding process creates two bytes of output for every byte of
  input. Working a byte at at time also avoids endian problems for big-endian
  platforms.

  Make the building of libsmb and mount_smbfs unconditional, now that r292552
  has eliminated alignment and endian problems that were making it fail on
  some platforms.

PR:           180438
PR:           189415
Relnotes:	Yes