misc/cgo/testshared: disable TestTwoGopathShlibsGccgo

For #22224.

Change-Id: Iae873fddc72a79a96a32eaeb5d4dd885eaf810cb
Reviewed-on: https://go-review.googlesource.com/73851
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

misc/cgo/testshared/shared_test.go

@@ -647,6 +647,8 @@ func TestGoPathShlibGccgo(t *testing.T) {
 // library with gccgo, another GOPATH package that depends on the first and an
 // executable that links the second library.
 func TestTwoGopathShlibsGccgo(t *testing.T) {
+	t.Skip("golang.org/issue/22224")
+
 	gccgoContext := prepGccgo(t)
 
 	libgoRE := regexp.MustCompile("libgo.so.[0-9]+")