autoconf implementation for powl()

[Tom Vijlbrief]

Autoconf 2.67 uses the following code to test for powl():
===========
  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h.  */

#define _ISOC9X_SOURCE  1
#define _ISOC99_SOURCE  1
#define __USE_ISOC99    1
#define __USE_ISOC9X    1
#include <math.h>
int
main ()
{
        int value = powl (1.0) ;
  ;
  return 0;
}
_ACEOF
==============

This obviously fails because powl takes two arguments.
I expect:

int value = powl (1.0, 1.0);

It looks like a copy/paste error from fabsl(long double)