message: remove unnessecary print statement
  #resolves: 7881
  remove printf statement and associated variables from invMapPointSpherical() in undistort.cpp
diff: @@ -476,8 +476,6 @@ static Point2f mapPointSpherical(const Point2f& p, float alpha, Vec4d* J, int pr
  static Point2f invMapPointSpherical(Point2f _p, float alpha, int projType)
  {
  - static int avgiter = 0, avgn = 0;
  -
  double eps = 1e-12;
  Vec2d p(_p.x, _p.y), q(_p.x, _p.y), err;
  Vec4d J;
  @@ -502,14 +500,6 @@ static Point2f invMapPointSpherical(Point2f _p, float alpha, int projType)
  //q -= Vec2d((J.t()*J).inv()*(J.t()*err));
  }
  - if( i < maxiter )
  - {
  - avgiter += i;
  - avgn++;
  - if( avgn == 1500 )
  - printf("avg iters = %g\n", (double)avgiter/avgn);
  - }
  -
  return i < maxiter ? Point2f((float)q[0], (float)q[1]) : Point2f(-FLT_MAX, -FLT_MAX);
  }
  