test/convert5: skip mipsle

It's broken on 32-bit architectures, and mips (be) has been in the skip
list. mipsle is somehow forgotten, so add it.

Updates golang#67304

Change-Id: I6d12185c21c37d0524d245e0a7025e30add1fb6b
Reviewed-on: https://go-review.googlesource.com/c/go/+/743740
Reviewed-by: Julian Zhu <jz531210@gmail.com>
Reviewed-by: Keith Randall <khr@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>

Author: Rongronggg9

test/convert5.go

@@ -4,7 +4,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build !wasm && !386 && !arm && !mips
+//go:build !wasm && !386 && !arm && !mips && !mipsle
 
 // TODO fix this to work for wasm and 32-bit architectures.
 // Doing more than this, however, expands the change.