Fix compilation error on MACOS: implicit instantiation of undefined template std::array

GeoModelTools/GeoModelXML/GeoModelXml/src/MakeGenericTrap.cxx

@@ -13,6 +13,8 @@
 #include "xercesc/util/XMLString.hpp"
 #include "GeoModelXml/GmxUtil.h"
 
+#include <array>
+
 
 using namespace xercesc;