patch 8.1.1627: header file contains mixed comment style

Problem:    Header file contains mixed comment style.
Solution:   Use // style comments.
diff --git a/src/version.c b/src/version.c
index e78733a..0620a21 100644
--- a/src/version.c
+++ b/src/version.c
@@ -778,6 +778,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1627,
+/**/
     1626,
 /**/
     1625,