4519 ABI checking needs to adapt to modern times, run by default

*** 30,39 ****
--- 30,40 ----
  # will contain the resulting archives. It is based off the onnv
  # release. It sets NIGHTLY_OPTIONS to make nightly do:
  #       DEBUG build only (-D, -F)
  #       do not bringover from the parent (-n)
  #       runs 'make check' (-C)
+ #       checks for new interfaces in libraries (-A)
  #       runs lint in usr/src (-l plus the LINTDIRS variable)
  #       sends mail on completion (-m and the MAILTO variable)
  #       creates packages for PIT/RE (-p)
  #       checks for changes in ELF runpaths (-r)
  #       build and use this workspace's tools in $SRC/tools (-t)
*** 41,51 ****
  # - This file is sourced by "bldenv.sh" and "nightly.sh" and should not 
  #   be executed directly.
  # - This script is only interpreted by ksh93 and explicitly allows the
  #   use of ksh93 language extensions.
  #
! export NIGHTLY_OPTIONS='-FnCDlmprt'
  
  #
  # -- PLEASE READ THIS --
  #
  # The variables  GATE and CODEMGR_WS must always be customised to
--- 42,52 ----
  # - This file is sourced by "bldenv.sh" and "nightly.sh" and should not 
  #   be executed directly.
  # - This script is only interpreted by ksh93 and explicitly allows the
  #   use of ksh93 language extensions.
  #
! export NIGHTLY_OPTIONS='-FnCDAlmprt'
  
  #
  # -- PLEASE READ THIS --
  #
  # The variables  GATE and CODEMGR_WS must always be customised to