patch 7.4.1568

Problem:    Using CTRL-] in help on option in parentheses doesn't work.
Solution:   Skip the "(" in "('". (Hirohito Higashi)

src/ex_cmds.c

@@ -6114,6 +6114,11 @@ find_help_tags(
 		    || (arg[0] == '\\' && arg[1] == '{'))
 	      *d++ = '\\';
 
+	  /*
+	   * If tag starts with "('", skip the "(". Fixes CTRL-] on ('option'.
+	   */
+	  if (*arg == '(' && arg[1] == '\'')
+	      arg++;
 	  for (s = arg; *s; ++s)
 	  {
 	    /*

src/version.c

@@ -743,6 +743,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1568,
 /**/
     1567,
 /**/