patch 8.1.0908: can't handle large value for %{nr}v in regexp

Problem:    Can't handle large value for %{nr}v in regexp. (Kuang-che Wu)
Solution:   Give an error if the value is too large. (closes #3948)
diff --git a/src/version.c b/src/version.c
index a66e8b6..a6d7add 100644
--- a/src/version.c
+++ b/src/version.c
@@ -784,6 +784,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    908,
+/**/
     907,
 /**/
     906,