dev-python/gst-python: bump to 1.16.2, add py3.8 support

Package-Manager: Portage-2.3.84, Repoman-2.3.20
Signed-off-by: Mart Raudsepp <leio@gentoo.org>

dev-python/gst-python/files/1.16.2-python3.8.patch

@@ -0,0 +1,39 @@
+From 22f28155d86e27c4134de4ed2861264003fcfd23 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 | 9 ++++++++-
+ 1 file changed, 8 insertions(+), 1 deletion(-)
+
+diff --git a/meson.build b/meson.build
+index 744b7ce..fe4ca7a 100644
+--- a/meson.build
++++ b/meson.build
+@@ -24,7 +24,14 @@ pygobject_dep = dependency('pygobject-3.0', fallback: ['pygobject', 'pygobject_d
+ 
+ pymod = import('python')
+ python = pymod.find_installation(get_option('python'))
+-python_dep = python.dependency(required : true)
++pythonver = python.language_version()
++
++# Workaround for https://github.com/mesonbuild/meson/issues/5629
++# https://gitlab.freedesktop.org/gstreamer/gst-python/issues/28
++python_dep = dependency('python-@0@-embed'.format(pythonver), version: '>=3', required: false)
++if not python_dep.found()
++  python_dep = python.dependency(required : true)
++endif
+ 
+ python_abi_flags = python.get_variable('ABIFLAGS', '')
+ pylib_loc = get_option('libpython-dir')
+-- 
+2.20.1
+