Remove .def file generation, use attribute of declspec instead.

Author: cfis

lib/ruby-bindgen/visitors/rice/project.def.erb

@@ -3,4 +3,9 @@
 #include <rice/rice.hpp>
 
 extern "C"
-void <%= init_name %>();
+#if defined(_WIN32)
+__declspec(dllexport)
+#else
+__attribute__((visibility("default")))
+#endif
+void <%= init_name %>();

lib/ruby-bindgen/visitors/rice/project.hpp.erb

@@ -130,7 +130,6 @@ def visit_start
       def visit_end
         create_rice_include_header
         create_project_files
-        create_def_file
       end
 
       # Returns the path to the Rice include header (user-specified or auto-generated)
@@ -1854,16 +1853,6 @@ def create_project_files
         self.outputter.write(rice_cpp, content)
       end
 
-      def create_def_file
-        return unless @project
-
-        # Create def file to export Init function
-        def_name = "#{project}.def"
-        init_function = "Init_#{project}"
-
-        content = render_template("project.def", :init_function => init_function)
-        self.outputter.write(def_name, content)
-      end
 
       def figure_method(cursor)
         name = cursor.kind.to_s.delete_prefix("cursor_")