Unix PuTTY/pterm: remove a premature cmdline_arg_list_free.

If this occurs before cmdline_run_saved, then the latter will use its
saved pointers to arguments in the freed CmdlineArgList.

Affects uses of PuTTY without a saved session (like 'putty -ssh
foohost'), and a very small number of pterm options, in particular
-sessionlog.

This is the simplest possible fix: just remove the free completely,
so that the parsed command-line arguments leak. There's at most one
instance of them per process, so it doesn't matter.

unix/main-gtk-simple.c

@@ -551,8 +551,6 @@ bool do_cmdline(int argc, char **argv, bool do_everything, Conf *conf)
         }
     }
 
-    cmdline_arg_list_free(arglist);
-
     return err;
 }