patch 8.1.1116: cannot enforce a Vim script style

Problem:    Cannot enforce a Vim script style.
Solution:   Add the :scriptversion command. (closes #3857)
diff --git a/src/main.c b/src/main.c
index a07ce1b..5edcbdf 100644
--- a/src/main.c
+++ b/src/main.c
@@ -3166,6 +3166,7 @@
 	current_sctx.sc_sid = SID_ENV;
 	current_sctx.sc_seq = 0;
 	current_sctx.sc_lnum = 0;
+	current_sctx.sc_version = 1;
 #endif
 	do_cmdline_cmd(initstr);
 	sourcing_name = save_sourcing_name;