There are numerous checks that don't make much sense to report for deprecated
API, so skip those. This also required updating a few .ignore and .todo files.
The public API was removed a long time ago (with XAMCORE_2_0) but
the p/invoke was still present in the platform assemblies.
Since tvOS requires bitcode this can cause a problem when linking
natively since a direct call won't be possible. That would only
happen if the symbol is removed (from the binary, not just the
headers) and if the managed linker is not enabled (otherwise it
will always be removed).
* Not every old annotations have been migrated (work in progress, to be completed in another PR);
* Sanitation of the data files (e.g. removal of dupes and fixed, by Apple, entries) is done, but not automated (also a work in progress)
Even then this is immediately useful, i.e. better merged before 15.6 gets branched.