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[netcdfgroup] netcdf.h declares non-existing functions

Hi,
since netcdf-4.1.2, the netcdf.h file declares all netcdf4 functions, like nc_def_var_deflate and NC_NETCDF4, even if the library was compiled without hdf5 support, and does not have these functions. 

I have code like

#ifdef NC_NETCDF4
  nc_def_var_deflate(...)
#endif
which worked perfectly with netcdf3 and netcdf4 until 4.1.1. Since netcdf 4.1.2, this code compiles still, but when the netcdf-library was not compiled with hdf5 support, the code won't link with the library.
This means, that netcdf since 4.1.2 has a single API, but has different ABIs depending on netcdf-configure flags. I would suggest adding the 'Extra netcdf4 stuff.' function calls to the netcdf3 code, even if they are empty, e.g. 

int
nc_def_var_deflate(int ncid, int varid, int shuffle, int deflate,
                   int deflate_level)
{
        return NC_NOERR;
}


Best regards,

Heiko
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