fix oreswig build

Author: rolandlichters

QuantExt/qle/math/stabilisedglls.hpp

@@ -140,15 +140,15 @@ void StabilisedGLLS::calculate(
             acc(x[i]);
         }
         xShift_[0] = -mean(acc);
-        Real tmp = variance(acc);
+        Real tmp = boost::accumulators::variance(acc);
         if (!QuantLib::close_enough(tmp, 0.0))
             xMultiplier_[0] = 1.0 / std::sqrt(tmp);
         accumulator_set<Real, stats<boost::accumulators::tag::mean, boost::accumulators::tag::variance> > acc2;
         for (Size i = 0; i < static_cast<Size>(y.end() - y.begin()); ++i) {
             acc2(y[i]);
         }
         yShift_ = -mean(acc2);
-        Real tmp2 = variance(acc2);
+        Real tmp2 = boost::accumulators::variance(acc2);
         if (!QuantLib::close_enough(tmp2, 0.0))
             yMultiplier_ = 1.0 / std::sqrt(tmp2);
         break;
@@ -213,7 +213,7 @@ void StabilisedGLLS::calculate(
         }
         for (Size j = 0; j < acc.size(); ++j) {
             xShift_[j] = -mean(acc[j]);
-            Real tmp = variance(acc[j]);
+            Real tmp = boost::accumulators::variance(acc[j]);
             if (!QuantLib::close_enough(tmp, 0.0))
                 xMultiplier_[j] = 1.0 / std::sqrt(tmp);
         }
@@ -222,7 +222,7 @@ void StabilisedGLLS::calculate(
             acc2(y[i]);
         }
         yShift_ = -mean(acc2);
-        Real tmp2 = variance(acc2);
+        Real tmp2 = boost::accumulators::variance(acc2);
         if (!QuantLib::close_enough(tmp2, 0.0))
             yMultiplier_ = 1.0 / std::sqrt(tmp2);
         break;