Revert "Remove compat code from comint.el"

This reverts commit 4d00db5538dc0ef47cf1cdf425b895d04145fe9e.

We still have Emacs builds on systems with no multi-taskin.

diff --git a/lisp/comint.el b/lisp/comint.el
index 843cba148370e5d2b6ebe428db6f96c2fb5d489e..df947b93afadb4701fdef6985aea9f4c6103a160 100644 (file)
--- a/lisp/comint.el
+++ b/lisp/comint.el
@@ -735,6 +735,8 @@ contents are sent to the process as its initial input.
 If PROGRAM is a string, any more args are arguments to PROGRAM.
 
 Return the (possibly newly created) process buffer."
+  (or (fboundp 'start-file-process)
+      (error "Multi-processing is not supported for this system"))
   (setq buffer (get-buffer-create (or buffer (concat "*" name "*"))))
   ;; If no process, or nuked process, crank up a new one and put buffer in
   ;; comint mode.  Otherwise, leave buffer and existing process alone.