add stuff from old newlib to todo

build mman header

fix atexit

Start on support for aarch64

Fix options

Dan Robertson authored 7 years ago and Dan Robertson committed 7 years ago

 - Add aarch64 support
   - crt0 - add support to _start
   - platform - aarch64 does not have the open syscall. Instead most
     libc implementations use openat() with AT_FDCWD
 - Use sc instead of syscall. sc is the maintained fork of syscall.

wrap all function parameters in Options