patch 8.1.0905: complicated regexp causes a crash

Problem:    Complicated regexp causes a crash. (Kuang-che Wu)
Solution:   Limit the recursiveness of addstate(). (closes #3941)
diff --git a/src/version.c b/src/version.c
index 20fdcba..f28d69d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -784,6 +784,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    905,
+/**/
     904,
 /**/
     903,