netCDF: Add .gitignore from 4.4.1.1.
netCDF: Add .gitignore from 4.4.1.1.

This may need to be updated if we see build products showing up as
untracked files.

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