Needs discussion: Mac Workaround for “symbol not found in flat namesp…

…ace”

error and
ld: warning: -undefined dynamic_lookup may not work with chained fixups.

python/cpython#97524 (comment) Ronald Oussoren
> Another workaround is to target an older deployment target (before 11.0), but that's also not a long term solution.

This works and seems needed on my ARM M1 MacOS 12.7 21G816, when compiling with either Apple clang-1400.0.29.202
or Homebrew clang version 16.0.5.  The discussion there suggests that the Clang in Xcode 14.3 might fix this, but that
won’t run on my MacOS.

CMakeLists.txt

@@ -1,4 +1,5 @@
 cmake_minimum_required(VERSION 3.8)
+set(CMAKE_OSX_DEPLOYMENT_TARGET "11.0" CACHE STRING "")
 include(ProcessorCount)
 
 project(Alive2)