patch 8.1.0240: g:actual_curbuf set in wrong scope

Problem:    g:actual_curbuf set in wrong scope. (Daniel Hahler)
Solution:   Prepend the "g:" name space. (closes #3279)

Author: brammool

src/buffer.c

@@ -4229,7 +4229,7 @@ build_stl_str_hl(
 
 #ifdef FEAT_EVAL
 	    vim_snprintf((char *)tmp, sizeof(tmp), "%d", curbuf->b_fnum);
-	    set_internal_string_var((char_u *)"actual_curbuf", tmp);
+	    set_internal_string_var((char_u *)"g:actual_curbuf", tmp);
 
 	    save_curbuf = curbuf;
 	    save_curwin = curwin;

src/version.c

@@ -794,6 +794,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    240,
 /**/
     239,
 /**/