fixed linker error

Author: drebbe-intrepid

src/exceptions.cpp

@@ -27,7 +27,7 @@ int initialize_exceptions(PyObject* module)
     return 1;
 }
 
-PyObject* _set_ics_exception(PyObject* exception, char* msg, const char* func_name)
+PyObject* _set_ics_exception(PyObject* exception, const char* msg, const char* func_name)
 {
     std::stringstream ss;
     std::string function = std::string(func_name);