message: Find pthreads on iOS using workaround
diff: @@ -19,6 +19,16 @@ else()
  endif()
  endif()
  +if (${CMAKE_SYSTEM_NAME} STREQUAL "iOS")
  + # Fix for PThread library not in path
  + set(CMAKE_THREAD_LIBS_INIT "-lpthread")
  + set(CMAKE_HAVE_THREADS_LIBRARY 1)
  + set(CMAKE_USE_WIN32_THREADS_INIT 0)
  + set(CMAKE_USE_PTHREADS_INIT 1)
  +
  + find_package(Threads REQUIRED)
  +endif()
  +
  # Rename sqlite3* symbols to cesium_sqlite3* so they don't conflict with UE's sqlite3,
  # which has a bunch of limitations and is not considered public.
  set(PRIVATE_CESIUM_SQLITE ON)
  