Add more define-detection for ARM64.
Add more define-detection for ARM64.

Fixes #6.

bugdebugger/double-conversion,google/double-conversion,project-zerus/double-conversion,bugdebugger/double-conversion,floitsch/double-conversion,project-zerus/double-conversion,bos/double-conversion,floitschG/double-conversion,google/double-conversion,floitsch/double-conversion,google/double-conversion,bos/double-conversion,floitschG/double-conversion,bos/double-conversion