(exec_error,fork_error,dup2_error,pipe_error): Removed unneeded functions.

src/misc.c

@@ -659,30 +659,6 @@ mknod_error (char const *name)
   call_arg_error ("mknod", name);
 }
 
-void
-exec_error (char const *name)
-{
-  call_arg_error ("exec", name);
-}
-
-void
-fork_error (char const *name)
-{
-  call_arg_error ("fork", name);
-}
-
-void
-dup2_error (char const *name)
-{
-  call_arg_error ("dup2", name);
-}
-
-void
-pipe_error (char const *name)
-{
-  call_arg_error ("pipe", name);
-}
-
 void
 open_error (char const *name)
 {