patch 8.0.0792: spell test leaves files behind

Problem:    Spell test leaves files behind.
Solution:   Delete the files.
diff --git a/src/testdir/test_spell.vim b/src/testdir/test_spell.vim
index 83da2a0..e4c236c 100644
--- a/src/testdir/test_spell.vim
+++ b/src/testdir/test_spell.vim
@@ -4,6 +4,16 @@
   finish
 endif
 
+func TearDown()
+  set nospell
+  call delete('Xtest.aff')
+  call delete('Xtest.dic')
+  call delete('Xtest.latin1.add')
+  call delete('Xtest.latin1.add.spl')
+  call delete('Xtest.latin1.spl')
+  call delete('Xtest.latin1.sug')
+endfunc
+
 func Test_wrap_search()
   new
   call setline(1, ['The', '', 'A plong line with two zpelling mistakes', '', 'End'])
@@ -226,6 +236,7 @@
 func Test_zz_sal_and_addition()
   set enc=latin1
   set spellfile=
+  call writefile(g:test_data_dic1, "Xtest.dic")
   call writefile(g:test_data_aff_sal, "Xtest.aff")
   mkspell! Xtest Xtest
   set spl=Xtest.latin1.spl spell
diff --git a/src/version.c b/src/version.c
index 350897b..3b45c94 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    792,
+/**/
     791,
 /**/
     790,