Patch [3520194] Fix compiler warning for non-virtual destructor by Andy Maloney.

git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@1235 67173fc5-114c-0410-ac8e-9d2fd5bffc1f

code/IFCUtil.h

@@ -238,6 +238,10 @@ public:
 
 public:
 
+
+	virtual ~Curve() {}
+
+
 	// check if a curve is closed 
 	virtual bool IsClosed() const = 0;