patch 8.0.0579: duplicate test case for quickfix

Problem:    Duplicate test case for quickfix.
Solution:   Remove the function. (Yegappan Lakshmanan)

src/testdir/test_quickfix.vim

@@ -2022,15 +2022,3 @@ func Test_qf_free()
   call XfreeTests('c')
   call XfreeTests('l')
 endfunc
-
-func Test_no_reuse_mem()
-  set efm=E,%W%m,
-  cgetexpr ['C']
-  set efm=%C%m
-  lexpr '0'
-  lopen
-  call setqflist([], 'r')
-  caddbuf
-
-  set efm&
-endfunc

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    579,
 /**/
     578,
 /**/