util/eventbus: also disable websocket debug on Android

So tsnet-on-Android is smaller, like iOS.

Updates #12614
Updates #15297

Change-Id: I97ae997f5d17576024470fe5fea93d9f5f134bde
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

util/eventbus/debughttp_off.go

@@ -0,0 +1,20 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+//go:build ios || android
+
+package eventbus
+
+import "tailscale.com/tsweb"
+
+func registerHTTPDebugger(d *Debugger, td *tsweb.DebugHandler) {
+	// The event bus debugging UI uses html/template, which uses
+	// reflection for method lookups. This forces the compiler to
+	// retain a lot more code and information to make dynamic method
+	// dispatch work, which is unacceptable bloat for the iOS build.
+	// We also disable it on Android while we're at it, as nobody
+	// is debugging Tailscale internals on Android.
+	//
+	// TODO: https://github.com/tailscale/tailscale/issues/15297 to
+	// bring the debug UI back to iOS somehow.
+}