VMS build: don't forget the generation marker when removing files

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/7703)

Configurations/descrip.mms.tmpl

@@ -823,7 +823,7 @@ $target : $args{generator}->[0] $deps
         \@ DELETE/SYMBOL/LOCAL extradefines
         \@ $incs_off
         RENAME \$\@-i \$\@
-        DELETE \$\@-S
+        DELETE \$\@-S;
 EOF
               }
               # Otherwise....