patch 8.1.2173: searchit() has too many arguments

Problem:    Searchit() has too many arguments.
Solution:   Move optional arguments to a struct.  Add the "wrapped" argument.
diff --git a/src/gui.c b/src/gui.c
index 860add2..31be46c 100644
--- a/src/gui.c
+++ b/src/gui.c
@@ -5383,7 +5383,7 @@
 	i = msg_scroll;
 	if (down)
 	{
-	    (void)do_search(NULL, '/', ga.ga_data, 1L, searchflags, NULL, NULL);
+	    (void)do_search(NULL, '/', ga.ga_data, 1L, searchflags, NULL);
 	}
 	else
 	{
@@ -5391,7 +5391,7 @@
 	     * direction */
 	    p = vim_strsave_escaped(ga.ga_data, (char_u *)"?");
 	    if (p != NULL)
-	        (void)do_search(NULL, '?', p, 1L, searchflags, NULL, NULL);
+	        (void)do_search(NULL, '?', p, 1L, searchflags, NULL);
 	    vim_free(p);
 	}