utils/ not reproducible in some environments

Originally created by @anonym on #12737 (Redmine)

See #12608 (comment 44739) for arnaud’s diffoscope report. There are also .torrent:s for the good ISO, and for arnaud’s.

This might just be another instance of #12608 (comment 44694) because the diff looks like:

  Directory listing of /utils/linux/
│  d---------   0    0    0            2048 May 21 2017 [     51 02]  . 
│  d---------   0    0    0            2048 May 21 2017 [     50 02]  .. 
│ -----------   0    0    0          200312 May 21 2017 [ 588009 00]  syslinux.;1 
│ +----------   0    0    0          200312 May 21 2017 [ 588345 00]  syslinux.;1 
│  
│  Directory listing of /utils/mbr/
│  d---------   0    0    0            2048 May 21 2017 [     52 02]  . 
│  d---------   0    0    0            2048 May 21 2017 [     50 02]  .. 
│ -----------   0    0    0             440 May 21 2017 [ 588107 00]  mbr.bin;1 
│ +----------   0    0    0             440 May 21 2017 [ 588443 00]  mbr.bin;1 
│  
│  Directory listing of /utils/win32/
│  d---------   0    0    0            2048 May 21 2017 [     53 02]  . 
│  d---------   0    0    0            2048 May 21 2017 [     50 02]  .. 
│ -----------   0    0    0          243712 May 21 2017 [ 588108 00]  syslinux.exe;1 
│ +----------   0    0    0          243712 May 21 2017 [ 588444 00]  syslinux.exe;1

I.e. only “extents” are shifted, which is expected since live/filesystem.squashfs got a size that was almost 10 MiB larger.

Parent Task: #5630 (closed)