d2: Disable binary syscall interface

 * This is long since deprecated and doesn't compile anymore. I have no
   idea why it was enabled on the stock ROM.

Change-Id: Ie04bba22d2d8f4a8233fb87a9807d1536b4ebe22
Fix build for GCC 4.7

Change-Id: I4e9265369174d82b55fd435bc47887972f99c9d4