Fix test_tocdl to pass on Windows.

[ELundby45]

Fixes test_tocdl on Windows.

The expected output is:

netcdf ubyte {
dimensions:
        d = 2 ;
variables:
        byte ub(d) ;
                ub:_Unsigned = "true" ;
        byte sb(d) ;
        byte sb2(d) ;
                sb2:_Unsigned = "false" ;

// global attributes:
                :_Format = "classic" ;
}

But when the full path is provided, the output is something like:

netcdf C\:\\Users\\dev-admin\\Desktop\\netcdf\\netcdf4_1737132718267\\test_tmp\\test\\ubyte {
dimensions:
        d = 2 ;
variables:
        byte ub(d) ;
                ub:_Unsigned = "true" ;
        byte sb(d) ;
        byte sb2(d) ;
                sb2:_Unsigned = "false" ;

// global attributes:
                :_Format = "classic" ;
}

Using the basename fixes this.

[CLAassistant]

All committers have signed the CLA.

[ELundby45]

Looks like this issue might be isolated to my environment. Feel free to close this if it's not helpful.