patch 8.1.1697: cannot build with MSVC

Problem:    Cannto build with MSVC.
Solution:   Remove the backslashes after the @<< mechanism.
diff --git a/src/version.c b/src/version.c
index e5c084f..7d8f700 100644
--- a/src/version.c
+++ b/src/version.c
@@ -778,6 +778,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1697,
+/**/
     1696,
 /**/
     1695,