adopt for new compiler version

Author: 9il

source/mir/optim/fit_splie.d

@@ -45,7 +45,7 @@ FitSplineResult!T fitSpline(alias d = "a - b", T)(
     if (points.length < x.length && lambda == 0)
     {
         static immutable exc = new Exception("fitSpline: points.length has to be greater or equal x.length when lambda is 0.0");
-        throw exc;
+        throw cast()exc;
     }
 
     FitSplineResult!T ret;

source/mir/optim/least_squares.d

@@ -173,10 +173,10 @@ LeastSquaresResult!T optimize(alias f, alias g = null, alias tm = null, T)(
 {
     auto ret = optimizeLeastSquares!(f, g, tm, T)(settings, m, x, l, u);
     if (ret.status == -1)
-        throw leastSquaresException_maxIterations;
+        throw cast()leastSquaresException_maxIterations;
     else
     if (ret.status < -1)
-        throw leastSquaresExceptions[ret.status + 32];
+        throw cast()leastSquaresExceptions[ret.status + 32];
     return ret;
 }