patch 8.0.0888: compiler warnings with 64 bit build

Problem:    Compiler warnings with 64 bit build.
Solution:   Add type cast of change the type. (Mike Williams)
diff --git a/src/version.c b/src/version.c
index 29703ed..5a1660a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    888,
+/**/
     887,
 /**/
     886,