drqs-69340099: 'bdlb_stringrefutil': Fix matrix build '-W' errors.
drqs-69340099: 'bdlb_stringrefutil': Fix matrix build '-W' errors.

bloomberg/bde,bloomberg/bde,bloomberg/bde,che2/bde,che2/bde,bloomberg/bde,che2/bde,che2/bde,bloomberg/bde