(minor) mingw/windows: fixed compile warning "unknown conversion type character 'L'"
(minor) mingw/windows: fixed compile warning "unknown conversion type character 'L'"

  Probably don't need "long doubles" for calculating performance
  anyways. switched to using doubles and avoid the mingw/windows printf
  formating mess for long doubles.

boyle/zedhat,boyle/zedhat,boyle/zedhat