xcb-proto: backport fix for python gcd function

This backports the fix [1] for the following build error for nativesdk on
Fedora 33 which is caused by the removal of fractions.gcd() in favor of
math.gcd() in python 3.9 [2]:

ImportError: cannot import name 'gcd' from 'fractions' (/usr/lib64/python3.9/fractions.py)

[1] https://gitlab.freedesktop.org/xorg/proto/xcbproto/-/commit/426ae35bee1fa0fdb8b5120b1dcd20cee6e34512
[2] https://bugs.python.org/issue39350

(From OE-Core rev: 0f688c1419b1e2dfddff3c985f89a3f1949fc9fb)

Signed-off-by: Richard Leitner <richard.leitner@skidata.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-graphics/xorg-proto/xcb-proto/0001-xcbgen-use-math-gcd-for-python-3-5.patch

@@ -0,0 +1,40 @@
+From 426ae35bee1fa0fdb8b5120b1dcd20cee6e34512 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Bj=C3=B6rn=20Esser?= <besser82@fedoraproject.org>
+Date: Mon, 1 Jun 2020 12:24:16 +0200
+Subject: [PATCH] xcbgen: Use math.gcd() for Python >= 3.5.
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+fractions.gcd() has been deprecated since Python 3.5, and
+was finally dropped in Python 3.9.  It is recommended to
+use math.gcd() instead.
+
+Signed-off-by: Björn Esser <besser82@fedoraproject.org>
+Upstream-Status: Backport [https://gitlab.freedesktop.org/xorg/proto/xcbproto/-/commit/426ae35bee1fa0fdb8b5120b1dcd20cee6e34512]
+Signed-off-by: Richard Leitner <richard.leitner@skidata.com>
+---
+ xcbgen/align.py | 7 ++++++-
+ 1 file changed, 6 insertions(+), 1 deletion(-)
+
+diff --git a/xcbgen/align.py b/xcbgen/align.py
+index d4c12ee..5c4f517 100644
+--- a/xcbgen/align.py
++++ b/xcbgen/align.py
+@@ -2,7 +2,12 @@
+ This module contains helper classes for alignment arithmetic and checks
+ '''
+ 
+-from fractions import gcd
++from sys import version_info
++
++if version_info[:2] >= (3, 5):
++    from math import gcd
++else:
++    from fractions import gcd
+ 
+ class Alignment(object):
+ 
+-- 
+GitLab
+

meta/recipes-graphics/xorg-proto/xcb-proto_1.13.bb

@@ -11,7 +11,8 @@ LICENSE = "MIT"
 LIC_FILES_CHKSUM = "file://COPYING;md5=d763b081cb10c223435b01e00dc0aba7 \
                     file://src/dri2.xml;beginline=2;endline=28;md5=f8763b13ff432e8597e0d610cf598e65"
 
-SRC_URI = "http://xcb.freedesktop.org/dist/${BP}.tar.bz2"
+SRC_URI = "http://xcb.freedesktop.org/dist/${BP}.tar.bz2 \
+           file://0001-xcbgen-use-math-gcd-for-python-3-5.patch"
 SRC_URI[md5sum] = "abe9aa4886138150bbc04ae4f29b90e3"
 SRC_URI[sha256sum] = "7b98721e669be80284e9bbfeab02d2d0d54cd11172b72271e47a2fe875e2bde1"