patch 8.2.1225: linker errors when building with dynamic Python 3.9

Problem:    Linker errors when building with dynamic Python 3.9.
Solution:   Add #defined items. (closes #6461)
diff --git a/src/version.c b/src/version.c
index 2a915fb..100448d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1225,
+/**/
     1224,
 /**/
     1223,