patch 8.0.1687: 64 bit compiler warnings

Problem:    64 bit compiler warnings.
Solution:   change type, add type cast. (Mike Williams)
diff --git a/src/version.c b/src/version.c
index 08b6728..4fc5de0 100644
--- a/src/version.c
+++ b/src/version.c
@@ -763,6 +763,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1687,
+/**/
     1686,
 /**/
     1685,