test/old: remove test.out files

Do this for new-style tests too, because they run after the old-style
tests which don't clean up their temp files.

Reverts ebd251c

src/nvim/testdir/Makefile

@@ -164,5 +164,6 @@ newtestssilent: $(NEW_TESTS)
 
 %.res: %.vim .gdbinit
 	@echo "[OLDTEST] Running" $*
+	@rm -rf $*.failed test.ok $(RM_ON_RUN)
 	@mkdir -p $(TMPDIR)
 	@/bin/sh runnvim.sh $(ROOT) $(NVIM_PRG) $* $(RUN_VIMTEST) -u NONE -S runtest.vim $*.vim

src/nvim/testdir/test_autocmd.vim

@@ -1469,7 +1469,6 @@ func Test_ReadWrite_Autocmds()
   augroup END
 
   " Test for the FileAppendPre and FileAppendPost autocmds
-  call delete('test.out')
   augroup Test2
     au!
     au BufNewFile      *.c    read Xtest.c