updated for version 7.3.966
Problem:    There is ":py3do" but no ":pydo".
Solution:   Add the ":pydo" command. (Lilydjwg)
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index 5ce0b5d..056339e 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -268,6 +268,7 @@
 #endif
 #ifndef FEAT_PYTHON
 # define ex_python		ex_script_ni
+# define ex_pydo		ex_ni
 # define ex_pyfile		ex_ni
 #endif
 #ifndef FEAT_PYTHON3