[jni] Do not fail flutter build on desktop if jdk is unavailable

[HosseinYousefi]

Closes #2781.

[github-actions]

PR Health

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// Copyright (c) 2025, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

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pkgs/objective_c/lib/src/ns_input_stream.dart

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The following packages contain symbols visible in the public API, but not exported by the library. Export these symbols or remove them from your publicly visible API.

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Breaking changes ✔️

Package	Change	Current Version	New Version	Needed Version	Looking good?
jni	None	0.15.1	0.15.2	0.15.1	✔️

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[coveralls]

coverage: 87.445%. remained the same
when pulling 72f854c on dont-fail-on-desktop
into 5501355 on main.

[goderbauer]

LGTM