patch 8.1.0985: crash with large number in regexp

Problem:    Crash with large number in regexp. (Kuang-che Wu)
Solution:   Check for long becoming negative int. (closes #)
diff --git a/src/version.c b/src/version.c
index 74850a0..9b87302 100644
--- a/src/version.c
+++ b/src/version.c
@@ -780,6 +780,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    985,
+/**/
     984,
 /**/
     983,