Remove netCDF 4.2 and netCDF-fortran-4.2

Newer versions of Linux require updated versions of the netCDF C and
Fortran libraries.  Remove the netcdf-4.2 and netcdf-fortran-4.2
directories in preparation of adding newer versions in the subsequent
commit.

Signed-off-by: Bob Yantosca <yantosca@seas.harvard.edu>
Update netCDF to v4.3.2 and netCDF-fortran to v4.4.1

The newest netCDF libraries are necessary in order to build
GEOS-Chem-Libraries for the latest Linux OS releases.

Also modified GEOS-Chem-Libraries/src/GNUmakefile to point to the
new netCDF file folders.

Signed-off-by: Bob Yantosca <yantosca@seas.harvard.edu>