patch 8.1.1376: warnings for size_t/int mixups

Problem:    Warnings for size_t/int mixups.
Solution:   Change types, add type casts. (Mike Williams)
diff --git a/src/version.c b/src/version.c
index 0fd12fe..26c4071 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1376,
+/**/
     1375,
 /**/
     1374,