auto: Use x86-64 CABI for foreign function on arm target

Fixed CABI problem on arm target.

Related issue: #4513
Related commit: 
- https://github.com/mozilla/rust/commit/987f824f2#L16R1497   
  (use x86_64 abi for arm target)

- https://github.com/mozilla/rust/commit/b72d4d70a#L2R46
- https://github.com/mozilla/rust/commit/b72d4d70a#L2R923 
  (accidentally use default abi for arm target)