Quick bug-fix release to address some issues:

• tunnel-interface-observer: Fix start() crash on i/tvOS, when SCDynamicStoreCopyKeyList() fails. Thanks @mrmacete!
• darwin-mapper: Initialize TLV before constructors. Thanks @jiska!
• darwin-mapper: Fix TLV init runtime code for arm64. Thanks @jiska!
• arm64-writer: Fix encoding of UBFM and LS{L,R}. Thanks @jiska!