feedback: when not in curses mode, write error messages to the terminal

No errors ought to occur when not in curses mode, but when they *do*
occur, increase the chances that we can figure out what happened.

src/winio.c

@@ -2254,10 +2254,6 @@ void statusline(message_type importance, const char *msg, ...)
 	bool old_whitespace = ISSET(WHITESPACE_DISPLAY);
 
 	UNSET(WHITESPACE_DISPLAY);
-
-	/* When not in curses mode, there is no status bar to display anything on. */
-	if (isendwin())
-		return;
 #endif
 
 	/* Ignore a message with an importance that is lower than the last one. */
@@ -2270,6 +2266,13 @@ void statusline(message_type importance, const char *msg, ...)
 	vsnprintf(compound, MAXCHARLEN * COLS + 1, msg, ap);
 	va_end(ap);
 
+	/* When not in curses mode, write the message to standard error. */
+	if (isendwin()) {
+		fprintf(stderr, "\n%s\n", compound);
+		free(compound);
+		return;
+	}
+
 #if !defined(NANO_TINY) && defined(ENABLE_MULTIBUFFER)
 	if (!we_are_running && importance == ALERT && openfile && !openfile->fmt &&
 						!openfile->errormessage && openfile->next != openfile)