patch 8.0.0338: :recover test fails on MS-Windows

Problem:    :recover test fails on MS-Windows.
Solution:   Use non-existing directory on MS-Windows.
diff --git a/src/testdir/test_recover.vim b/src/testdir/test_recover.vim
index aa291b1..33cd54b 100644
--- a/src/testdir/test_recover.vim
+++ b/src/testdir/test_recover.vim
@@ -7,6 +7,10 @@
   call assert_fails('recover', 'E305:')
   close!
 
+  if has('win32')
+    " can write in / directory on MS-Windows
+    set dir=/notexist/
+  endif
   call assert_fails('split Xtest', 'E303:')
   set dir&
 endfunc
diff --git a/src/version.c b/src/version.c
index 73f9929..aac6dae 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    338,
+/**/
     337,
 /**/
     336,