patch 8.1.0900: ConPTY many crash with 32-bit build

Problem:    ConPTY many crash with 32-bit build.
Solution:   Fix function declarations. (Ken Takata, closes #3943)
diff --git a/src/version.c b/src/version.c
index f3e1081..b02be7c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -784,6 +784,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    900,
+/**/
     899,
 /**/
     898,