patch 8.2.2112: running tests may leave some files behind

Problem:    Running tests may leave some files behind.
Solution:   Delete the right files.  Fix a few typos. (Dominique Pellé,
            closes #7436
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index 450aae4..2415e4d 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -722,7 +722,7 @@
   call assert_equal('typescript', &filetype)
   bwipe!
 
-  call delete('Xfile.hook')
+  call delete('Xfile.ts')
   filetype off
 endfunc
 
diff --git a/src/testdir/test_messages.vim b/src/testdir/test_messages.vim
index 158e94b..4f8c751 100644
--- a/src/testdir/test_messages.vim
+++ b/src/testdir/test_messages.vim
@@ -323,7 +323,7 @@
 
   " clean up
   call StopVimInTerminal(buf)
-  call delete('Xtest_diff_rnu')
+  call delete('Xtest_quit_message')
 endfunc
 
 " vim: shiftwidth=2 sts=2 expandtab
diff --git a/src/testdir/test_mksession.vim b/src/testdir/test_mksession.vim
index c2b8fb9..723eb8e 100644
--- a/src/testdir/test_mksession.vim
+++ b/src/testdir/test_mksession.vim
@@ -381,7 +381,7 @@
   let term_cmd = ''
   for line in lines
     if line =~ '^terminal'
-      call assert_report('session must not restore teminal')
+      call assert_report('session must not restore terminal')
     endif
   endfor
 
@@ -398,7 +398,7 @@
   let term_cmd = ''
   for line in lines
     if line =~ '^terminal'
-      call assert_report('session must not restore teminal')
+      call assert_report('session must not restore terminal')
     endif
   endfor
 
@@ -416,7 +416,7 @@
   let term_cmd = ''
   for line in lines
     if line =~ '^terminal'
-      call assert_report('session must not restore teminal')
+      call assert_report('session must not restore terminal')
     endif
   endfor
 
@@ -434,7 +434,7 @@
   let term_cmd = ''
   for line in lines
     if line =~ '^terminal'
-      call assert_report('session must not restore teminal')
+      call assert_report('session must not restore terminal')
     endif
   endfor
 
@@ -940,6 +940,7 @@
   call assert_equal('Xtwoalt', bufname('#'))
   only
   bwipe!
+  call delete('Xtest_altfile')
 endfunc
 
 " vim: shiftwidth=2 sts=2 expandtab
diff --git a/src/version.c b/src/version.c
index 07dc6a2..f441581 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2112,
+/**/
     2111,
 /**/
     2110,