internal/testenv: do not delete target file

We did not create it. We should not delete it.

Change-Id: If98454ab233ce25367e11a7c68d31b49074537dd
Reviewed-on: https://go-review.googlesource.com/37030Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/internal/testenv/testenv_windows.go

@@ -30,7 +30,6 @@ func initWinHasSymlink() {
 			winSymlinkErr = err
 		}
 	}
-	os.Remove("target")
 }
 
 func hasSymlink() (ok bool, reason string) {