Add __unused to the list of __dead, __dead2, __pure, __pure2 etc.

gcc-2.7 has __attribute__((unused)) as a postfix operator on function
arguments to prevent -Wunused from complaining about them.  gcc < 2.7
doesn't have anything like this (and doesn't care about it either).

eg:
int foo(bar, baz)
  int bar __unused;	/* needed because of function pointer typing */
  char *baz __unused;
{
  return (1);
}

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