Replace libmesh_C_isnan_xxx calls with std::isnan().
Replace libmesh_C_isnan_xxx calls with std::isnan().

And similarly for std::isinf(). Both should be in <cmath> as of C++11.

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