[klibc] select.h not working on ia64

[Kay Sievers]

__FD_SET, __FD_CLR, __FD_ISSET, __FD_ZERO

are inside of __KERNEL__ in:
  include/asm-ia64/posix_types.h

and therefore not available.

I've added stuff like this to our code:
  #ifndef __FD_SET
  #define __FD_SET(d, set) ((set)->fds_bits[__FDELT(d)] |= __FDMASK(d))
  #endif

but it would be nice if this can be solved in klibc.

Thanks,
Kay