assimp: fix include directory with split outputs

Assimp used a hardcoded path to the include directory, which doesn't work with
split outputs. The included patch has been accepted upstream.

pkgs/development/libraries/assimp/default.nix

···
-{ lib, stdenv, fetchFromGitHub, cmake, boost, zlib }:
+{ lib, stdenv, fetchFromGitHub, fetchpatch, cmake, boost, zlib }:
 
 stdenv.mkDerivation rec {
   pname = "assimp";
···
     rev = "v${version}";
     hash = "sha256-GNSfaP8O5IsjGwtC3DFaV4OiMMUXIcmHmz+5TCT/HP8=";
   };
+
+  patches = [
+    # Fix include directory with split outputs
+    # https://github.com/assimp/assimp/pull/4337
+    (fetchpatch {
+      url = "https://github.com/assimp/assimp/commit/5dcaf445c3da079cf43890a0688428a7e1de0b30.patch";
+      sha256 = "sha256-KwqTAoDPkhFq469+VaUuGoqfymu2bWLG9W3BvFvyU5I=";
+    })
+  ];
 
   nativeBuildInputs = [ cmake ];
   buildInputs = [ boost zlib ];