currency: disable flaky TestLinking

It fails on a bunch of builders and it's not clear what it's testing.

It hasn't been fixed since Oct 2016 so it gets disabled.

Updates golang/go#17538

Change-Id: I0f454c46b31b8306cc604c36ec6d06cc6ad703b5
Reviewed-on: https://go-review.googlesource.com/c/text/+/170783
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>
diff --git a/currency/currency_test.go b/currency/currency_test.go
index db93a0f..6c05ecb 100644
--- a/currency/currency_test.go
+++ b/currency/currency_test.go
@@ -149,6 +149,7 @@
 `
 
 func TestLinking(t *testing.T) {
+	t.Skip("skipping flaky test; see golang.org/issue/17538")
 	base := getSize(t, `fmt.Print(currency.CLDRVersion)`)
 	symbols := getSize(t, `fmt.Print(currency.Symbol(currency.USD))`)
 	if d := symbols - base; d < 2*1024 {