patch 8.1.0616: NSIS installer is outdated

Problem:    NSIS installer is outdated.
Solution:   Use modern syntax, MUI2 and make it work better. Add translations.
            (Ken Takata, closes #3501)
diff --git a/src/version.c b/src/version.c
index daeabf5..aadd161 100644
--- a/src/version.c
+++ b/src/version.c
@@ -800,6 +800,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    616,
+/**/
     615,
 /**/
     614,