Bump to xamarin-android-api-compatibility/master/c050ba3c. Updates expected APIs for BCL assemblies. Use `azureedge.net` instead of `blob.core.windows.net`. It's behind a CDN and way faster outside US. Use the new profiler init symbol name, `mono_profiler_init()`. Avoid dumping the content of `libmono-profiler-log.so` when tests fail. The binary contents aren't meaningful, and needlessly bloat the output log. Fix `eglib` path, as mono changed it's location. Don't skip errors from mono's `make test` target anymore. Stop building Mono's `net_4_x` profile. It isn't required to build the `monodroid` profile and *not* building it saves lots of time. The tools needed by XA are taken from the new `monodroid_tools` profile instead. Update Mono version phrasing in `README.md`. Using an explicit version is just a recipe for outdated info, instead rewrite it to be generic since the build will complain on an outdated Mono anyway. Add more exclusions to `LinkerDescription.xml` for BCL tests, which are used in the new `System.Reflection.Emit.SaveTest()`. Update `.gitignore` for some paths. `Xamarin.Android.Common.props` is generated as part of the build, and the `.rawproto` files created by gradle should be ignored. 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