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

@@ -30,10 +30,11 @@
 # 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)

@@ -41,11 +42,11 @@
 # - 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'
+export NIGHTLY_OPTIONS='-FnCDAlmprt'
 
 #
 # -- PLEASE READ THIS --
 #
 # The variables  GATE and CODEMGR_WS must always be customised to