libgit2: 0.27.8 -> 0.28.4

* https://github.com/libgit2/libgit2/releases/tag/v0.28.0
* https://github.com/libgit2/libgit2/releases/tag/v0.28.1
* https://github.com/libgit2/libgit2/releases/tag/v0.28.2
* https://github.com/libgit2/libgit2/releases/tag/v0.28.3
* https://github.com/libgit2/libgit2/releases/tag/v0.28.4

pkgs/development/libraries/git2/default.nix

@@ -1,25 +1,25 @@
 { stdenv, fetchFromGitHub, cmake, pkgconfig, python3
-, zlib, libssh2, openssl, http-parser, curl
+, zlib, libssh2, openssl, http-parser
 , libiconv, Security
 }:
 
 stdenv.mkDerivation rec {
   pname = "libgit2";
-  version = "0.27.8";
-  # keep the version in sync with pythonPackages.pygit2 and libgit2-glib
+  version = "0.28.4";
+  # keep the version in sync with python3.pkgs.pygit2 and libgit2-glib
 
   src = fetchFromGitHub {
     owner = "libgit2";
     repo = "libgit2";
     rev = "v${version}";
-    sha256 = "0wzx8nkyy9m7mx6cks58chjd4289vjsw97mxm9w6f1ggqsfnmbr9";
+    sha256 = "171b25aym4q88bidc4c76y4l6jmdwifm3q9zjqsll0wjhlkycfy1";
   };
 
   cmakeFlags = [ "-DTHREADSAFE=ON" ];
 
   nativeBuildInputs = [ cmake python3 pkgconfig ];
 
-  buildInputs = [ zlib libssh2 openssl http-parser curl ]
+  buildInputs = [ zlib libssh2 openssl http-parser ]
     ++ stdenv.lib.optional stdenv.isDarwin Security;
 
   propagatedBuildInputs = stdenv.lib.optional (!stdenv.isLinux) libiconv;