Y2038: Add 64-bit time for all architectures

* Add macro __TIMESIZE equal to the bit size of time_t.
  It equals the architecture __WORDSIZE except for x32
  where it equals 64.

* Add type __time64_t which is always 64-bit. On 64-bit
  architectures and on x32, it is #defined as time_t.
  On other architectures, it has its own type.

* Replace all occurrences of internal_time_t with
  __time64_t.

The  __time64_t type is public so that the public time_t type
can be a typedef or #define of __time64_t when we switch the
public API to 64-bit time.

Also, provide a function (inline) to check if a __time64_t
value fits in a (possibly 32-bit) time_t. This is used when
a 32-bit-time wrapper calls a glibc function which returns
a __time64_t, so that the wrapper can detect times which
it cannot properly return to its caller, and can flag an
EOVERFLOW accordingly.

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