Auto-generated C++ code fails to compile with "-Werror -Wextra -Wall" g++ compiler flags

If the following command is used to auto-generate the C++ code
thrift --gen cpp:cob_style foo.thrift
then some of the auto-generated code contains the following:

class FooCobClient : virtual public FooCobClIf {
...
virtual void completed__(bool success) {}
...
};

The above code fails to compile if we use g++ with the "-Werror -Wextra -Wall" compiler options:
gen-cpp/Foo.h:767: warning: unused parameter 'success'

The solution is trivial: just comment-out the unused "success" argument when the code is
auto-generated (see attached patch).