Remove unused patch.

12157.patch

@@ -1,31 +0,0 @@
-From bb337935d04b63d454a81e16a9ac2063a7d945c3 Mon Sep 17 00:00:00 2001
-From: Antony Lee <anntzer.lee@gmail.com>
-Date: Tue, 18 Sep 2018 22:46:17 +0200
-Subject: [PATCH] Properly declare the interactive framework for the qt4foo
- backends.
-
----
- lib/matplotlib/backends/backend_qt4agg.py   | 2 +-
- lib/matplotlib/backends/backend_qt4cairo.py | 2 +-
- 2 files changed, 2 insertions(+), 2 deletions(-)
-
-diff --git a/lib/matplotlib/backends/backend_qt4agg.py b/lib/matplotlib/backends/backend_qt4agg.py
-index 65785bbd32b..8f4e265ac42 100644
---- a/lib/matplotlib/backends/backend_qt4agg.py
-+++ b/lib/matplotlib/backends/backend_qt4agg.py
-@@ -8,4 +8,4 @@
- 
- @_BackendQT5Agg.export
- class _BackendQT4Agg(_BackendQT5Agg):
--    pass
-+    required_interactive_framework = "qt4"
-diff --git a/lib/matplotlib/backends/backend_qt4cairo.py b/lib/matplotlib/backends/backend_qt4cairo.py
-index f94851da382..94d703afa4e 100644
---- a/lib/matplotlib/backends/backend_qt4cairo.py
-+++ b/lib/matplotlib/backends/backend_qt4cairo.py
-@@ -3,4 +3,4 @@
- 
- @_BackendQT5Cairo.export
- class _BackendQT4Cairo(_BackendQT5Cairo):
--    pass
-+    required_interactive_framework = "qt4"