w32: Change the condition for struct timespec.
w32: Change the condition for struct timespec.

* w32/npth.h: Fix the ifdef case.

--

GnuPG-bug-id: 2202
Signed-off-by: NIIBE Yutaka <34feb69f206f6fec69fb4bd79c126fcbde2c8e6a@fsij.org>

gpg/npth,gpg/npth