don't use multisap yet in basic demo.

fix crash in multi sap (due to new pair manager)

src/BulletCollision/BroadphaseCollision/btMultiSapBroadphase.cpp

@@ -103,6 +103,8 @@ void	btMultiSapBroadphase::calculateOverlappingPairs(btDispatcher* dispatcher)
 
 	btBroadphasePairArray&	overlappingPairArray = m_overlappingPairs->getOverlappingPairArray();
 
+#ifndef USE_HASH_PAIRCACHE
+
 	//perform a sort, to find duplicates and to sort 'invalid' pairs to the end
 	overlappingPairArray.heapSort(btBroadphasePairSortPredicate());
 
@@ -172,6 +174,8 @@ void	btMultiSapBroadphase::calculateOverlappingPairs(btDispatcher* dispatcher)
 	m_invalidPair = 0;
 #endif//CLEAN_INVALID_PAIRS
 
+#endif //USE_HASH_PAIRCACHE
+
 }