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/option.c b/src/option.c
index d1fdcc1..4564395 100644
--- a/src/option.c
+++ b/src/option.c
@@ -407,7 +407,7 @@
     char_u	*def_val[2];	// default values for variable (vi and vim)
 #ifdef FEAT_EVAL
     sctx_T	script_ctx;	// script context where the option was last set
-# define SCTX_INIT , {0, 0, 0}
+# define SCTX_INIT , {0, 0, 0, 1}
 #else
 # define SCTX_INIT
 #endif
@@ -5911,6 +5911,7 @@
 		script_ctx.sc_sid = set_sid;
 		script_ctx.sc_seq = 0;
 		script_ctx.sc_lnum = 0;
+		script_ctx.sc_version = 1;
 	    }
 	    set_option_sctx_idx(idx, opt_flags, script_ctx);
 	}