nouveau: Fix gcc6 / c++11 auto_ptr deprecation compiler warnings

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>

src/gallium/drivers/nouveau/codegen/nv50_ir_util.h

@@ -94,7 +94,11 @@ public:
    virtual void reset() { assert(0); } // only for graph iterators
 };
 
+#if __cplusplus >= 201103L
+typedef std::unique_ptr<Iterator> IteratorRef;
+#else
 typedef std::auto_ptr<Iterator> IteratorRef;
+#endif
 
 class ManipIterator : public Iterator
 {