patch 7.4.1115
Problem:    MS-Windows: make clean in testdir doesn't clean everything.
Solution:   Add command to delete X* directories. (Ken Takata)
diff --git a/src/testdir/Make_dos.mak b/src/testdir/Make_dos.mak
index 47f9d22..4809930 100644
--- a/src/testdir/Make_dos.mak
+++ b/src/testdir/Make_dos.mak
@@ -89,6 +89,7 @@
 	-if exist Xdir1 rd /s /q Xdir1
 	-if exist Xfind rd /s /q Xfind
 	-del X*
+	-for /d %i in (X*) do @rmdir /s/q %i
 	-if exist viminfo del viminfo
 	-if exist test.log del test.log
 	-if exist messages del messages