patch 9.0.0388: the do_arg_all() function is too long

Problem:    The do_arg_all() function is too long.
Solution:   Split the function in smaller parts. (Yegappan Lakshmanan,
            closes #11062)
diff --git a/src/version.c b/src/version.c
index 5ab26b1..d4fc4d5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -704,6 +704,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    388,
+/**/
     387,
 /**/
     386,