python36: Fix PR pkg/53229 (closing stdin leads to EBADF)

Also NetBSD seems affected by bpo-30225, address that using fstat(2)
on NetBSD too.

Reported upstream via bpo-33384:

 <https://bugs.python.org/issue33384>

Index: distinfo
===================================================================
RCS file: /cvsroot/pkgsrc/lang/python36/distinfo,v
retrieving revision 1.18
diff -u -p -r1.18 distinfo
--- distinfo	29 Mar 2018 15:28:16 -0000	1.18
+++ distinfo	19 May 2018 15:08:08 -0000
@@ -13,6 +13,7 @@ SHA1 (patch-Modules_makesetup) = a06786e
 SHA1 (patch-Modules_nismodule.c) = 1bafe9b06359586d027a77011b103877590d947d
 SHA1 (patch-Modules_socketmodule.c) = e6bdb8990cd9b8cf0b0ff48e6ae7b664681a9924
 SHA1 (patch-Modules_socketmodule.h) = 13a3290eb72078067060d3e71b7baa08f3eb591c
+SHA1 (patch-Python_pylifecycle.c) = 7b0da511690abd11876f42da3fd3ac6ffc16efbf
 SHA1 (patch-Python_thread__pthread.h) = fb81eaa604b4ed7c1b64c3f4731d58a8aee257be
 SHA1 (patch-configure) = d999d63bd437500a3a8f176fcd5aa3c48ded836e
 SHA1 (patch-pyconfig.h.in) = 58e2c03489f9b6e4d88f144d8c09773f92eacd61
Index: patches/patch-Python_pylifecycle.c
===================================================================
RCS file: patches/patch-Python_pylifecycle.c
diff -N patches/patch-Python_pylifecycle.c
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ patches/patch-Python_pylifecycle.c	19 May 2018 15:08:08 -0000
@@ -0,0 +1,15 @@
+$NetBSD$
+
+Also NetBSD is affected by bpo-30225, use fstat(2) on NetBSD too.
+
+--- Python/pylifecycle.c.orig	2018-03-28 09:19:31.000000000 +0000
++++ Python/pylifecycle.c
+@@ -1040,7 +1040,7 @@ initsite(void)
+ static int
+ is_valid_fd(int fd)
+ {
+-#ifdef __APPLE__
++#if defined(__APPLE__) || defined(__NetBSD__)
+     /* bpo-30225: On macOS Tiger, when stdout is redirected to a pipe
+        and the other side of the pipe is closed, dup(1) succeed, whereas
+        fstat(1, &st) fails with EBADF. Prefer fstat() over dup() to detect