Commit 9302d514 didn't properly convert `external/mono.tpnitems` into
`*_TPN` classes. In particular, `mono/boringssl`, which should be
included when `$(TpnIncludeExternalDependencies)`=True, was instead
included only when `includeBuildDeps` is True. Consequently,
`mono/boringssl` was *not* listed in `ThirdPartyNotices.txt` file
installed on macOS and Windows machines, even though
`libmono-btls-shared.so` is installed onto the dev's machine.
Review and verify the ThirdPartyNotice inclusion data, and remove the
`.tpnitems` files which have been verified.
With this change `bin/Debug/lib/xamarin.android/ThirdPartyNotices.txt`
has these changes:
* `android/platform/ndk` added, because of `libxamarin-app.so`
generation and decfbccf.
* `mono/boringssl` added, because of mono and
`libmono-btls-shared.so`.
* `mono/NUnitLite` added
* `zLibDll/minizip` removed, because of 3634b0f7.
After this change, `ThirdPartyNotices.txt` has these changes:
* `force-net/crc32.net` added, because of decfbccf.
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