dev-python/backports-zoneinfo: Backport segv fix for py3.8.7rc1+

Signed-off-by: Michał Górny <mgorny@gentoo.org>

dev-python/backports-zoneinfo/backports-zoneinfo-0.2.1-r1.ebuild

@@ -38,6 +38,12 @@ BDEPEND="
 # pytest-subtests
 distutils_enable_tests unittest
 
+PATCHES=(
+	# fix segv in py3.8.7rc1+
+	# https://github.com/pganssle/zoneinfo/pull/97
+	"${FILESDIR}"/${P}-py38.patch
+)
+
 python_test() {
 	if [[ ${EPYTHON} == pypy3 ]]; then
 		# pypy3.6 does not support dataclasses, and the backport

dev-python/backports-zoneinfo/files/backports-zoneinfo-0.2.1-py38.patch

@@ -0,0 +1,22 @@
+From 0e42cc3999b4e3833b5f3f41857b8c1e3c9143f3 Mon Sep 17 00:00:00 2001
+From: Pablo Galindo <pablogsal@gmail.com>
+Date: Mon, 21 Dec 2020 02:02:34 +0000
+Subject: [PATCH] Decrement the refcount of _PyLong_One in the correct branch
+
+---
+ lib/zoneinfo_module.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/lib/zoneinfo_module.c b/lib/zoneinfo_module.c
+index e0c72d3..07ef603 100644
+--- a/lib/zoneinfo_module.c
++++ b/lib/zoneinfo_module.c
+@@ -616,7 +616,7 @@ zoneinfo_fromutc(PyObject *obj_self, PyObject *dt)
+             Py_DECREF(args);
+             Py_DECREF(kwargs);
+             Py_DECREF(replace);
+-#ifndef ATLEAST_37
++#ifdef ATLEAST_37
+             Py_DECREF(one);
+ #endif
+