Fixed warnings when using swig

include/assimp/IOStream.hpp

@@ -61,7 +61,10 @@ namespace Assimp	{
  *  to the Importer. If you implement this interface, be sure to also provide an
  *  implementation for IOSystem that creates instances of your custom IO class.
 */
-class ASSIMP_API IOStream : public Intern::AllocateFromAssimpHeap
+class ASSIMP_API IOStream
+#ifndef SWIG
+	: public Intern::AllocateFromAssimpHeap
+#endif
 {
 protected:
 	/** Constructor protected, use IOSystem::Open() to create an instance. */

include/assimp/IOSystem.hpp

@@ -64,7 +64,10 @@ class IOStream;
  *  supply a custom implementation for IOStream.
  *
  *  @see Importer::SetIOHandler() */
-class ASSIMP_API IOSystem : public Intern::AllocateFromAssimpHeap
+class ASSIMP_API IOSystem
+#ifndef SWIG
+	: public Intern::AllocateFromAssimpHeap
+#endif
 {
 public:
 

include/assimp/LogStream.hpp

@@ -54,7 +54,10 @@ class IOSystem;
  *  details. Writing your own implementation of LogStream is just necessary if these
  *  are not enough for your purpose. */
 class ASSIMP_API LogStream
-	: public Intern::AllocateFromAssimpHeap	{
+#ifndef SWIG
+	: public Intern::AllocateFromAssimpHeap
+#endif
+{
 protected:
 	/** @brief	Default constructor	*/
 	LogStream() {

include/assimp/Logger.hpp

@@ -57,7 +57,10 @@ class LogStream;
  *  logging stuff ('DefaultLogger'). This class defines just basic logging
  *  behaviour and is not of interest for you. Instead, take a look at #DefaultLogger. */
 class ASSIMP_API Logger
-	: public Intern::AllocateFromAssimpHeap	{
+#ifndef SWIG
+	: public Intern::AllocateFromAssimpHeap
+#endif
+{
 public:
 
 	// ----------------------------------------------------------------------

include/assimp/ProgressHandler.hpp

@@ -52,7 +52,10 @@ namespace Assimp	{
  *  Each #Importer instance maintains its own #ProgressHandler. The default 
  *  implementation provided by Assimp doesn't do anything at all. */
 class ASSIMP_API ProgressHandler
-	: public Intern::AllocateFromAssimpHeap	{
+#ifndef SWIG
+	: public Intern::AllocateFromAssimpHeap
+#endif
+{
 protected:
 	/** @brief	Default constructor	*/
 	ProgressHandler () {