cmd/dist: disable broken TestDeps

Will debug soon but wanted to fix builders.

Change-Id: I921d58d1272370f3102ba1f86ad535f4c0f6b8db
Reviewed-on: https://go-review.googlesource.com/56970
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>

src/cmd/dist/deps_test.go

@@ -15,6 +15,7 @@ import (
 )
 
 func TestDeps(t *testing.T) {
+	t.Skip("broken - golang.org/issue/21522")
 	if testing.Short() && testenv.Builder() == "" {
 		t.Skip("skipping in short mode")
 	}