python3Packages.aggdraw: fix build with clang 16

Clang 16 defaults to C++17, which disallows the `register` storage class
specifier. Upstream has fixed this on a maintenance branch, but it is
not yet available in a release.

pkgs/development/python-modules/aggdraw/default.nix

@@ -1,5 +1,6 @@
 { lib
 , fetchFromGitHub
+, fetchpatch
 , buildPythonPackage
 , packaging
 , setuptools
@@ -23,6 +24,14 @@ buildPythonPackage rec {
     hash = "sha256-2yajhuRyQ7BqghbSgPClW3inpw4TW2DhgQbomcRFx94=";
   };
 
+  patches = [
+    # Removes `register` storage class specifier, which is not allowed in C++17.
+    (fetchpatch {
+      url = "https://github.com/pytroll/aggdraw/commit/157ed49803567e8c3eeb7dfeff4c116db35747f7.patch";
+      hash = "sha256-QSzpO90u5oSBWUzehRFbXgZ1ApEfLlfp11MUx6w11aI=";
+    })
+  ];
+
   nativeBuildInputs = [
     packaging
     setuptools