GCC 4.4 compatibility: std::unordered_map::reserve() doesn't exist yet.

src/MeshTools/Clean.h

@@ -66,8 +66,10 @@ template<class Vertex, size_t vertexSize = Vertex::Size> class Clean {
                    and index of vertex in the face. */
                 std::unordered_map<Math::Vector<vertexSize, size_t>, HashedVertex, IndexHash> table;
 
+                #ifndef MAGNUM_GCC44_COMPATIBILITY
                 /* Reserve space for all vertices */
                 table.reserve(vertices.size());
+                #endif
 
                 /* Go through all faces' vertices */
                 for(auto it = indices.begin(); it != indices.end(); ++it) {