fix spelling error

#define strdup _strdup

// the following functions ared defined to get rid of

// 'ambiguous call to overloaded function' error in VSS for mismathched type arguments

// 'ambiguous call to overloaded function' error in VSS for mismatched type arguments

#if !defined(__MINGW32__)

inline double pow(int i, int j){

  return pow((double)i,j);