patch 8.0.0809: MS-Windows: tests hang

Problem:    MS-Windows: tests hang.
Solution:   Delete the XfakeHOME directory.
diff --git a/src/testdir/Make_dos.mak b/src/testdir/Make_dos.mak
index fe2e2ba..2c00a15 100644
--- a/src/testdir/Make_dos.mak
+++ b/src/testdir/Make_dos.mak
@@ -54,6 +54,7 @@
 	-@if exist test.ok del test.ok
 	-@if exist Xdir1 rd /s /q Xdir1
 	-@if exist Xfind rd /s /q Xfind
+	-@if exist XfakeHOME rd /s /q XfakeHOME
 	-@del X*
 	-@if exist viminfo del viminfo
 	$(VIMPROG) -u dos.vim $(NO_INITS) "+set ff=unix|f test.out|wq" \
@@ -89,6 +90,7 @@
 	-if exist lua.vim del lua.vim
 	-if exist Xdir1 rd /s /q Xdir1
 	-if exist Xfind rd /s /q Xfind
+	-if exist XfakeHOME rd /s /q XfakeHOME
 	-del X*
 	-for /d %i in (X*) do @rmdir /s/q %i
 	-if exist viminfo del viminfo