ac07e85117
New option -Wno-format-extra-args : suppress warning for:
printf("foo", bar);
since that isn't interesting from the POV of this audit, and it's more
common than most in some code.
also, do format args checking for
printf(Aflag ? "format 1: %s" : "format 2: %s", bar);
albeit in a half-hearted way for now (just check the "then" case)