python: adapt to Magnum changes.

src/python/magnum/math.matrix.h

@@ -123,7 +123,7 @@ template<class T, class ...Args> void everyRectangularMatrixBuffer(py::class_<T,
                 throw py::error_already_set{};
             }
 
-            T out{Math::NoInit};
+            T out{NoInit};
 
             /* Expecting just an one-letter format */
             if(buffer.format[0] == 'f' && !buffer.format[1])

src/python/magnum/math.vector.h

@@ -157,7 +157,7 @@ template<class T, class ...Args> void everyVectorBuffer(py::class_<T, Args...>&
                 throw py::error_already_set{};
             }
 
-            T out{Math::NoInit};
+            T out{NoInit};
             initFromBuffer<T>(out, buffer);
             return out;
         }), "Construct from a buffer");