* agent/command-ssh.c (SSH_CONTROL_FILE_NAME): New macro to replace
the direct use of the string.
(struct control_file_s, control_file_t): New.
(open_control_file, close_control_file): New. Use them instead of
using fopen/fclose directly.
--
(cherry picked from commit 25fb53ab4ae7e1c098500229c776d29b82713a20)
Fixed conflicts in some variabale names.