MISRA 2004 Rule 10.4: cast of floating point

Used to allow casting of floating point expressions.

  EWL_C/src/sc/exp_StarCore.c Line: 150
  EWL_C/src/sun_math/Single_precision/e_expf.c Line: 113
  EWL_C/src/sun_math/Single_precision/s_expm1f.c Line: 123