drop obsolete patch from git as well

910588338cf2a17207c09b315baddf003e86316c.patch

@@ -1,22 +0,0 @@
-From 910588338cf2a17207c09b315baddf003e86316c Mon Sep 17 00:00:00 2001
-From: Dirk Farin <dirk.farin@gmail.com>
-Date: Sat, 18 Feb 2023 12:45:19 +0100
-Subject: [PATCH] calm compiler warning (#787)
-
----
- libheif/heif_colorconversion.cc | 2 +-
- 1 file changed, 1 insertion(+), 1 deletion(-)
-
-diff --git a/libheif/heif_colorconversion.cc b/libheif/heif_colorconversion.cc
-index 8245cb1ff..65f975612 100644
---- a/libheif/heif_colorconversion.cc
-+++ b/libheif/heif_colorconversion.cc
-@@ -1870,7 +1870,7 @@ Op_mono_to_RGB24_32::convert_colorspace(const std::shared_ptr<const HeifPixelIma
-     return nullptr;
-   }
- 
--  const uint8_t* in_y, * in_a;
-+  const uint8_t* in_y, * in_a = nullptr;
-   int in_y_stride = 0, in_a_stride;
- 
-   uint8_t* out_p;