[gfortran] Fix gfortran include problem

[François-Xavier Coudert]

>> What happens in the presence of symlinks?  Does
>> this patch (correctly?) follow the a symlink?
>
> I don't understand what you mean. Could you give an example along with
> the behaviour you expect?

Sorry, I should have added that the patch doesn't make any difference
between a symlink and a regular file in the same directory as the
symlink. That is, as far as I tested, the behaviour of this patch wrt
symlinks is exactly the same as g77.

FX