(Vdefault_file_name_coding_system): Extern it.

(create_process): Use ENCODE_FILE.

src/process.c

@@ -266,7 +266,7 @@ extern int timers_run;
 /* Maximum number of bytes to send to a pty without an eof.  */
 static int pty_max_bytes;
 
-extern Lisp_Object Vfile_name_coding_system;
+extern Lisp_Object Vfile_name_coding_system, Vdefault_file_name_coding_system;
 
 #ifdef HAVE_PTYS
 /* The file name of the pty opened by allocate_pty.  */
@@ -1487,8 +1487,7 @@ create_process (process, new_argv, current_dir)
        Protect it from permanent change.  */
     char **save_environ = environ;
 
-    current_dir
-      = Fencode_coding_string (current_dir, Vfile_name_coding_system, Qt);
+    current_dir = ENCODE_FILE (current_dir);
 
 #ifndef WINDOWSNT
     pid = vfork ();