Ignore one more warning with GCC 8.x compilers
Ignore one more warning with GCC 8.x compilers

The trigger comes from BOOST distributions

libMesh/libmesh,dschwen/libmesh,roystgnr/libmesh,hrittich/libmesh,jwpeterson/libmesh,dschwen/libmesh,90jrong/libmesh,dschwen/libmesh,jwpeterson/libmesh,pbauman/libmesh,jwpeterson/libmesh,jwpeterson/libmesh,capitalaslash/libmesh,capitalaslash/libmesh,BalticPinguin/libmesh,roystgnr/libmesh,hrittich/libmesh,dschwen/libmesh,capitalaslash/libmesh,capitalaslash/libmesh,BalticPinguin/libmesh,capitalaslash/libmesh,pbauman/libmesh,hrittich/libmesh,pbauman/libmesh,libMesh/libmesh,hrittich/libmesh,capitalaslash/libmesh,dschwen/libmesh,roystgnr/libmesh,hrittich/libmesh,BalticPinguin/libmesh,jwpeterson/libmesh,hrittich/libmesh,90jrong/libmesh,90jrong/libmesh,dschwen/libmesh,hrittich/libmesh,dschwen/libmesh,libMesh/libmesh,pbauman/libmesh,libMesh/libmesh,libMesh/libmesh,hrittich/libmesh,jwpeterson/libmesh,pbauman/libmesh,BalticPinguin/libmesh,dschwen/libmesh,libMesh/libmesh,BalticPinguin/libmesh,hrittich/libmesh,BalticPinguin/libmesh,jwpeterson/libmesh,libMesh/libmesh,jwpeterson/libmesh,roystgnr/libmesh,roystgnr/libmesh,roystgnr/libmesh,roystgnr/libmesh,90jrong/libmesh,90jrong/libmesh,pbauman/libmesh,BalticPinguin/libmesh,pbauman/libmesh,90jrong/libmesh,libMesh/libmesh,BalticPinguin/libmesh,capitalaslash/libmesh,90jrong/libmesh,90jrong/libmesh,90jrong/libmesh,capitalaslash/libmesh,pbauman/libmesh,pbauman/libmesh,roystgnr/libmesh