We added NativeAOT "GC Bridge" support in 869b0e0, but there are
still some tests we can enable.

Context: #10461

A follow up to #10461 which adds some more compatibility with the "standard"
MonoVM and CoreCLR runtime hosts, namely:

  * Support for setting environment variables via the environment file
    (`<AndroidEnvironment>` MSBuild item)
  * Support for setting **local** (that is, application level, not system
    level) system properties

In addition to the above, it makes NativeAOT use static libc++ instead of the
shared one, which not only shrinks the package size (`libc++_shared.so` is
around 9mb), but it also makes startup slightly faster.

Context: https://developer.android.com/about/versions/16/qpr2/
Context: https://android-developers.googleblog.com/2025/09/android-16-qpr2-beta-2-is-here.html

Android 16 Quarterly Platform Release 2 (QPR2) Beta 2 has been released.

  * [API-36.1 Beta 2 vs. API-CANARY Beta 1][0]
  * [API-36.1 Beta 2 vs. API-36][1]

The Android 16 QPR2 [Milestones and updates][2] section indicates
that Beta 2 is API stable!

We're not yet ready to do the enumification work, though.

Bind API-36.1 Beta 2 as an *unstable*, *un-enumified* binding.

[0]: https://developer.android.com/sdk/api_diff/36.1-incr/changes
[1]: https://developer.android.com/sdk/api_diff/36.1/changes
[2]: https://developer.android.com/about/versions/16/qpr2/overview#timeline