Adds static libdwarf and libelftc libraries built for Mach-O AArch64. These are not yet fully tested but this is a first pass to enable configuring and building drsyms and components that depend on it such as drcachesim. This enables using local M1 builds to replicate GA CI OSX build warnings.
Fixes build warnings and issues from things like the oldest OSX supported.
Fixes configuration issues from x86-only tests. Building the tests does not yet succeed.
Issue: #5383