Remove unused patch

Signed-off-by: Igor Gnatenko <i.gnatenko.brain@gmail.com>

0001-Attempt-to-fix-build-on-0.23.3.patch

@@ -1,27 +0,0 @@
-From d555dd66d4a35409b4d624e52562af44aa97e934 Mon Sep 17 00:00:00 2001
-From: =?UTF-8?q?Carlos=20Mart=C3=ADn=20Nieto?= <cmn@dwim.me>
-Date: Wed, 24 Feb 2016 14:49:32 +0100
-Subject: [PATCH] Attempt to fix build on 0.23.3
-
----
- pygit2/repository.py | 4 +++-
- 1 file changed, 3 insertions(+), 1 deletion(-)
-
-diff --git a/pygit2/repository.py b/pygit2/repository.py
-index f8a6cad..1713828 100644
---- a/pygit2/repository.py
-+++ b/pygit2/repository.py
-@@ -716,8 +716,10 @@ class Repository(_Repository):
-                 format_options.abbreviated_size = abbreviated_size
-             if always_use_long_format is not None:
-                 format_options.always_use_long_format = always_use_long_format
-+            dirty_ptr = None
-             if dirty_suffix:
--                format_options.dirty_suffix = ffi.new('char[]', to_bytes(dirty_suffix))
-+                dirty_ptr = ffi.new('char[]', to_bytes(dirty_suffix))
-+                format_options.dirty_suffix = dirty_ptr
-
-             buf = ffi.new('git_buf *', (ffi.NULL, 0))
-
---
-2.5.0