Can't compile with lyxstring

[Jean-Marc Lasgouttes]

With latest cvs, compilation dies with

cxx: Error: ../../../../lyx-devel/src/frontends/controllers/ControlCredits.C, line 57: 
          no instance of overloaded function "std::getline" matches the
          argument list
            argument types are: (std::ifstream, string)
                                std::getline(in, line);
--------------------------------^

This is because I configure --with-included-string, so that getline
can't work correctly. 

Angus, do you plan to change this code, or should I bother to try a
quick fix?

JMarc