* john/erts/fix-unc-paths-windows/OTP-15333/ERL-737:
  erts: Fix UNC path handling on Windows
  erts: Fix a compiler warning

* raimo/BSD-sockopt-pktoptions/ERIERL-187/OTP-14297:
  Fix bug for sockopt pktoptions on BSD

This is unlikely to be the last of the path problems seen after
OTP 21, and I'm starting to regret my decision to unconditionally
use long paths. The idea to hit all long-path problems all the time
was good in theory as it makes such bugs far more visible, but
there just aren't enough people who test pre-release versions on
Windows, making this the world's slowest game of whack-a-mole.

The macros for the BSD style option names had accidentally
wound up outside the option parsing loop, causing unclear
behaviour and Valgrind errors.

* raimo/receive-TOS-TCLASS/ERIERL-187/OTP-15145:
  Elaborate the disclaimer for 'pktoptions'
  Improve platform filter
  Fix endianness bug for CMSG parsing

* sverker/erts/robustify-dist-entry-states/OTP-15297:
  erts: Refactor port dist_entry & conn_id into PRTSD
  Remove ugly fail case macros
  Consolidate distribution entry state transitions
  erts: Fix bug in undocumented system_flag(scheduling_statistics)