patch 8.2.4668: buffer allocation failures insufficiently tested

Problem:    Buffer allocation failures insufficiently tested.
Solution:   Add tests for memory allocation failures. (Yegappan Lakshmanan,
            closes #10064)
diff --git a/src/version.c b/src/version.c
index 6742703..311b878 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4668,
+/**/
     4667,
 /**/
     4666,