[bug#41022] [PATCH core-updates] gnu: python-gst: Fix build with Python 3.8.

[Marius Bakke <mbakke@fastmail.com>]

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Christopher Baines <mail@cbaines.net> writes:

> Add a patch based on an upstream commit [1].
>
> 1: 10707f437f2fc3632067c6a0efa4432f7ebaf362
>
> * gnu/packages/patches/python-gst-fix-build-with-python-3.8.patch: New file.
> * gnu/local.mk (dist_patch_DATA): Add it.
> * gnu/packages/gstreamer.scm (python-gst)[source]: Use the patch.

[...]

> diff --git a/gnu/packages/patches/python-gst-fix-build-with-python-3.8.patch b/gnu/packages/patches/python-gst-fix-build-with-python-3.8.patch
> new file mode 100644
> index 0000000000..49f41e0c03
> --- /dev/null
> +++ b/gnu/packages/patches/python-gst-fix-build-with-python-3.8.patch
> @@ -0,0 +1,41 @@
> +From 10707f437f2fc3632067c6a0efa4432f7ebaf362 Mon Sep 17 00:00:00 2001
> +From: =?UTF-8?q?Sebastian=20Dr=C3=B6ge?= <sebastian@centricular.com>
> +Date: Fri, 13 Dec 2019 10:46:20 +0200
> +Subject: [PATCH] Fix build with Python 3.8 by also checking for
> + python-3.X-embed.pc
> +
> +Since Python 3.8 the normal checks don't include the Python libraries
> +anymore and linking of the gst-python module would fail.
> +
> +See also https://github.com/mesonbuild/meson/issues/5629
> +
> +Fixes https://gitlab.freedesktop.org/gstreamer/gst-python/issues/28
> +---
> + meson.build | 11 +++++++++--
> + 1 file changed, 9 insertions(+), 2 deletions(-)

Instead of the git patch format, can you add a short comment at the top
along with links to the upstream commit and issue like we usually do?

Otherwise LGTM, thanks!

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