Make QtXmlPatterns compile with the QExplicitlySharedDataPointer's static_cast

This module requires the static_casts to happen.

Change-Id: Iea2f5aa8c6033edffd920a6de73509f3ae19721d
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Kevin Funk <kevin.funk@kdab.com>

src/xmlpatterns/xmlpatterns.pro

@@ -2,7 +2,7 @@ TARGET     = QtXmlPatterns
 CONFIG += exceptions
 QT = core-private network
 
-DEFINES += QT_NO_USING_NAMESPACE
+DEFINES += QT_NO_USING_NAMESPACE QT_ENABLE_QEXPLICITLYSHAREDDATAPOINTER_STATICCAST
 win32-msvc*|win32-icc:QMAKE_LFLAGS += /BASE:0x61000000
 
 QMAKE_DOCS = $$PWD/doc/qtxmlpatterns.qdocconf