patch 8.2.0538: Vim9: VAR_PARTIAL is not used during compilation

Problem:    Vim9: VAR_PARTIAL is not used during compilation.
Solution:   Remove VAR_PARTIAL.
diff --git a/src/version.c b/src/version.c
index fece1a1..0c147cc 100644
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    538,
+/**/
     537,
 /**/
     536,