patch 8.2.4667: expandcmd() fails on an error

Problem:    expandcmd() fails on an error.
Solution:   On failure return the command unmodified. (yegappan Lakshmanan,
            closes #10063)
diff --git a/src/version.c b/src/version.c
index b6fd047..6742703 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4667,
+/**/
     4666,
 /**/
     4665,