Revert "cmd/go: re-enable TestCgoConsistentResults on solaris"

This reverts commit b89bcc1d.

Change-Id: Ief2f317ffc175f7e6002d0c39694876f46788c69
Reviewed-on: https://go-review.googlesource.com/23744Reviewed-by: Mikio Hara <mikioh.mikioh@gmail.com>

src/cmd/go/go_test.go

@@ -2778,6 +2778,10 @@ func TestCgoConsistentResults(t *testing.T) {
 	if !canCgo {
 		t.Skip("skipping because cgo not enabled")
 	}
+	if runtime.GOOS == "solaris" {
+		// See https://golang.org/issue/13247
+		t.Skip("skipping because Solaris builds are known to be inconsistent; see #13247")
+	}
 
 	tg := testgo(t)
 	defer tg.cleanup()