Rule 13.3 : float comparisons

These are typically used when a floating point matches a pattern (zero, Nan, etc...).

  ./src/math_double.c
  ./src/math_float.c
  ./src/sc/atan2_StarCore.c
  ./src/sc/exp_StarCore.c
  ./src/sun_math/Double_precision/e_lgamma_r.c
  ./src/sun_math/Double_precision/e_log.c
  ./src/sun_math/Double_precision/e_rem_pio2.c
  ./src/sun_math/Double_precision/k_rem_pio2.c
  ./src/sun_math/Double_precision/k_standard.c
  ./src/sun_math/Double_precision/s_log1p.c
  ./src/sun_math/Double_precision/s_matherr.c
  ./src/sun_math/Double_precision/s_nextafter.c