patch 8.1.0317: Cscope test fails when using shadow directory

Problem:    Cscope test fails when using shadow directory.
Solution:   Resolve symlink in Vim. (James McCoy, closes #3364)

src/testdir/test_cscope.vim

@@ -259,7 +259,12 @@ endfunc
 " Test ":cs add {dir}"  (add the {dir}/cscope.out database)
 func Test_cscope_add_dir()
   call mkdir('Xcscopedir', 'p')
-  call system('cscope -bk -fXcscopedir/cscope.out ../memfile_test.c')
+
+  " Cscope doesn't handle symlinks, so this needs to be resolved in case a
+  " shadow directory is being used.
+  let memfile = resolve('../memfile_test.c')
+  call system('cscope -bk -fXcscopedir/cscope.out ' . memfile)
+
   cs add Xcscopedir
   let a = execute('cscope show')
   let lines = split(a, "\n", 1)

src/version.c

@@ -794,6 +794,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    317,
 /**/
     316,
 /**/