test/fixedbugs: enable issue 10607 test on ppc64le

ppc64le supports both internal and external linking so I don't
think there is any reason for it to skip this test.

Change-Id: I05c80cc25909c0364f0a1fb7d20766b011ea1ebb
Reviewed-on: https://go-review.googlesource.com/32854Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

test/fixedbugs/issue10607.go

-// +build linux,!mips,!mipsle,!ppc64,!ppc64le
+// +build linux,!mips,!mipsle,!ppc64
 // run
 
 // Copyright 2015 The Go Authors. All rights reserved.