patch 8.0.0325: packadd test does not clean up symlink

Problem:    Packadd test does not clean up symlink.
Solution:   Delete the link. (Hirohito Higashi)

Author: brammool

src/testdir/test_packadd.vim

@@ -98,6 +98,7 @@ func Test_packadd_symlink_dir()
 
   set rtp&
   let rtp = &rtp
+  silent !rm top2_dir
 endfunc
 
 " Check command-line completion for 'packadd'

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    325,
 /**/
     324,
 /**/