patch 8.2.0638: MS-Windows: messages test fails

Problem:    MS-Windows: messages test fails.
Solution:   Clear environment variables.
diff --git a/src/version.c b/src/version.c
index 28d3179..3ba7452 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    638,
+/**/
     637,
 /**/
     636,