Update Haiku support (mono/mono#15674)

Update Haiku support (mono/mono#15674)

* Build System.Native.

* Disable `pthread_mutexattr_setprotocol` use, since it returns EINVAL on Haiku.

* Disable the `strerror` cache on Haiku. On Haiku, errors begin at `0x8000_0000` like a Win32 HRESULT. This means the indexing would be on negative numbers, which is a no-no. There are a few alternative ways to keep it though: hashtable, tuple array, offset...

Unfortunately, doesn't build all the way through. Has a tendency to bomb out during building `build-unix`. Will investigate why.

Commit migrated from https://github.com/mono/mono/commit/1059b3e6f59ef92ccba55092fa410e59fdae091f