cmd/dist: enable more cgo tests on ppc64le

The tests all pass (for me at least) so I don't think there is any
reason not to enable them.

Change-Id: I96e71383e573273f442a849914cf6458ada14f82
Reviewed-on: https://go-review.googlesource.com/32855Reviewed-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>

src/cmd/dist/test.go

@@ -809,7 +809,7 @@ func (t *tester) cgoTest(dt *distTest) error {
 	case "android-arm",
 		"dragonfly-386", "dragonfly-amd64",
 		"freebsd-386", "freebsd-amd64", "freebsd-arm",
-		"linux-386", "linux-amd64", "linux-arm", "linux-s390x",
+		"linux-386", "linux-amd64", "linux-arm", "linux-ppc64le", "linux-s390x",
 		"netbsd-386", "netbsd-amd64":
 
 		cmd := t.addCmd(dt, "misc/cgo/test", "go", "test", "-ldflags", "-linkmode=external")