patch 8.1.1637: after running tests and clean the XfakeHOME directory remains

Problem:    After running tests and clean the XfakeHOME directory remains.
Solution:   Use "rm -rf". (Hirohito Higashi)
diff --git a/src/testdir/Make_amiga.mak b/src/testdir/Make_amiga.mak
index a5855c3..df77e4d 100644
--- a/src/testdir/Make_amiga.mak
+++ b/src/testdir/Make_amiga.mak
@@ -26,7 +26,7 @@
 	csh -c echo ALL DONE
 
 clean:
-	csh -c \rm -rf *.out /tmp/* Xdotest small.vim tiny.vim mbyte.vim test.ok viminfo
+	csh -c \rm -rf *.out Xdir1 Xfind XfakeHOME Xdotest small.vim tiny.vim mbyte.vim test.ok viminfo
 
 .in.out:
 	copy $*.ok test.ok