Remove useless(?) method. Anyway *retval_to_s* method don't exist...

Author: root

Diff for: lib/redmine_git_hosting/shell_redirector.rb

@@ -138,11 +138,6 @@ def puts(*args)
     end
 
 
-    def putc(obj)
-      @extra_args << retval_to_s(obj)
-    end
-
-
     def write(obj)
       @extra_args << obj.to_s
     end