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

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

* siri/cuddle:
  [logger] Skip app level test if app cannot be loaded
  Terminate nodes after failed test cases in erl_distribution_SUITE
  Skip performance test on build types other than 'opt'

* raimo/receive-TOS-TCLASS/ERIERL-187/OTP-15145:
  Write testcases for recvtos and friends
  Fix term buffer overflow bug
  Fix documentation due to feedback
  Implement socket option recvtos and friends

Use os:type() and os:version() to predict if the individual options
are supposed to be supported.  We'll see if this holds.

A hanging node from this suite can fail later tests, so terminate all
nodes() after each test case.