Changes in legacy_xdr_io.C for -Wshadow.
Changes in legacy_xdr_io.C for -Wshadow.

Issue #24.

Mbewu/libmesh,Mbewu/libmesh,Mbewu/libmesh,Mbewu/libmesh,Mbewu/libmesh,Mbewu/libmesh,Mbewu/libmesh,Mbewu/libmesh,Mbewu/libmesh