updated for version 7.3.1213

Problem:    Can't build with small features and Python.
Solution:   Adjust #ifdefs.

src/buffer.c

@@ -984,6 +984,10 @@ do_bufdel(command, arg, addr_count, start_bnr, end_bnr, forceit)
 
     return errormsg;
 }
+#endif /* FEAT_LISTCMDS */
+
+#if defined(FEAT_LISTCMDS) || defined(FEAT_PYTHON) \
+	|| defined(FEAT_PYTHON3) || defined(PROTO)
 
 /*
  * Implementation of the commands for the buffer list.
@@ -1364,8 +1368,7 @@ do_buffer(action, start, dir, count, forceit)
 
     return OK;
 }
-
-#endif /* FEAT_LISTCMDS */
+#endif
 
 /*
  * Set current buffer to "buf".  Executes autocommands and closes current