comment the workaround of the EIGEN_EMPTY_STRUCT_CTOR workaround for gcc 4.3
comment the workaround of the EIGEN_EMPTY_STRUCT_CTOR workaround for gcc 4.3

cjntaylor/eigen,cjntaylor/eigen,pthulhu/eigen,cjntaylor/eigen,pthulhu/eigen,cjntaylor/eigen,pthulhu/eigen,pthulhu/eigen,pthulhu/eigen