Improve POSIX conformance of <signal.h>.

- This header file has always depended on pthread_t, pthread_attr_t,
  struct timespec, size_t and uid_t. Only as of POSIX 2008, these
  dependencies have been states explicitly. They should now be defined.

- In our implementation, struct sigevent::sigev_notify_attributes has
  type "void *" instead of "pthread_attr_t *". My guess is that this was
  done to prevent pulling in the pthread types, but this can easily be
  avoided by using the underlying structure types.

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