Removed erroneous #define.

diff --git a/src/Include/VCPPDefinitions.hpp b/src/Include/VCPPDefinitions.hpp
index 15465ea..60bd8d1 100644
--- a/src/Include/VCPPDefinitions.hpp
+++ b/src/Include/VCPPDefinitions.hpp
@@ -80,7 +80,6 @@
 #define XALAN_NO_COVARIANT_RETURN_TYPE
 #endif
 
-#define XALAN_USE_DEQUE_FOR_VECTOR_BOOL
 #define XALAN_LSTRSUPPORT
 #define XALAN_FULL_WCHAR_SUPPORT
 #define XALAN_RTTI_AVAILABLE