test: skip issue22200b.go on mipsle

It should be skipped on 32-bit architectures.

Change-Id: If7a64b9e90e47c3e8734dd62729bfd2944ae926c
Reviewed-on: https://go-review.googlesource.com/70071Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>

test/fixedbugs/issue22200b.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.
 
-// +build !386,!amd64p32,!arm,!mips
+// +build !386,!amd64p32,!arm,!mips,!mipsle
 
 package p