patch 8.2.5103: build fails with small features

Problem:    Build fails with small features.
Solution:   Add #ifdef.  Skip test on MS-Windows.
diff --git a/src/version.c b/src/version.c
index 2f61521..e3c52b7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -735,6 +735,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    5103,
+/**/
     5102,
 /**/
     5101,