sniproxy: switch to pcre2 (#437597)

pkgs/by-name/sn/sniproxy/package.nix

@@ -2,10 +2,11 @@
   lib,
   stdenv,
   fetchFromGitHub,
+  fetchurl,
   autoreconfHook,
   gettext,
   libev,
-  pcre,
+  pcre2,
   pkg-config,
   udns,
 }:
@@ -23,6 +24,14 @@ stdenv.mkDerivation rec {
 
   patches = [
     ./gettext-0.25.patch
+    (fetchurl {
+      name = "compat-pcre2.patch";
+      # Using Arch Linux patch because the following upstream patches do not apply cleanly:
+      # https://github.com/dlundquist/sniproxy/commit/62e621f050f79eb78598b1296a089ef88a19ea91
+      # https://github.com/dlundquist/sniproxy/commit/7fdd86c054a21f7ac62343010de20f28645b14d2
+      url = "https://gitlab.archlinux.org/archlinux/packaging/packages/sniproxy/-/raw/3272f9f0d406c51122f90708bfcc7b4ba0eb38c9/sniproxy-0.6.1-pcre2.patch?inline=false";
+      hash = "sha256-v6qdBAWXit0Zg43OsgzCTb4cSPm7gsEXVd7W8LvBgMk=";
+    })
   ];
 
   nativeBuildInputs = [
@@ -32,7 +41,7 @@ stdenv.mkDerivation rec {
   buildInputs = [
     gettext
     libev
-    pcre
+    pcre2
     udns
   ];