patch 8.2.3208: dynamic library load error does not mention why it failed

Problem:    Dynamic library load error does not mention why it failed.
Solution:   Add the error message. (Martin Tournoij, closes #8621)
diff --git a/src/version.c b/src/version.c
index 387a6e6..64622c3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -756,6 +756,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3208,
+/**/
     3207,
 /**/
     3206,