LegacySupport 1.0.5

• Tweak math.h to determine the existence of long long.
• Ensure _tlv_atexit and __cxa_thread_atexit are available on all systems.
• Ensure library symbols are visible if MACOSX_DEPLOYMENT_TARGET is set.
• Wrap copyfile_state_get to add support for COPYFILE_STATE_COPIED.
• In header file CoreFoundation/CoreFoundation.h, add alias for CFPropertyListCreateWithStream.
• In header file uuid/uuid.h, add typedef for uuid_string_t.
• Add no-op version of pthread_setname_np in pthread.h.
• Modify how wrapped functions are handled: use original symbol in library.