Don't assume the __x86_64__ pointer size to avoid warnings on x32.
Don't assume the __x86_64__ pointer size to avoid warnings on x32.

__x86_64__ is defined on the on the x32 architecture and the conditionals in
debug.c therefore assume the size of (void*) etc:

  debug.c: In function 'getMcontextEip':
  debug.c:757:12: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
       return (void*) uc->uc_mcontext.gregs[16]; /* Linux 64 */
              ^
  debug.c: In function 'logRegisters':
  debug.c:920:21: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
       logStackContent((void**)uc->uc_mcontext.gregs[15]);

We can remedy this by checking for __ILP32__ first. See:

  https://wiki.debian.org/ArchitectureSpecificsMemo

... for more info.

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