phpExtensions.rdkafka: Move to separate directory

pkgs/development/php-packages/rdkafka/default.nix

@@ -0,0 +1,21 @@
+{ buildPecl, lib, pkgs, pcre' }:
+
+buildPecl {
+  pname = "rdkafka";
+
+  version = "4.0.3";
+  sha256 = "1g00p911raxcc7n2w9pzadxaggw5c564md6hjvqfs9ip550y5x16";
+
+  buildInputs = [ pkgs.rdkafka pcre' ];
+
+  postPhpize = ''
+    substituteInPlace configure \
+      --replace 'SEARCH_PATH="/usr/local /usr"' 'SEARCH_PATH=${pkgs.rdkafka}'
+  '';
+
+  meta = with lib; {
+    description = "Kafka client based on librdkafka";
+    homepage = "https://github.com/arnaud-lb/php-rdkafka";
+    maintainers = teams.php.members;
+  };
+}

pkgs/top-level/php-packages.nix

@@ -130,25 +130,7 @@ in
 
     pthreads = callPackage ../development/php-packages/pthreads { };
 
-    rdkafka = buildPecl {
+    rdkafka = callPackage ../development/php-packages/rdkafka { };
-      version = "4.0.3";
-      pname = "rdkafka";
-
-      sha256 = "1g00p911raxcc7n2w9pzadxaggw5c564md6hjvqfs9ip550y5x16";
-
-      buildInputs = with pkgs; [ rdkafka pcre' ];
-
-      postPhpize = ''
-        substituteInPlace configure \
-          --replace 'SEARCH_PATH="/usr/local /usr"' 'SEARCH_PATH=${pkgs.rdkafka}'
-      '';
-
-      meta = {
-        description = "Kafka client based on librdkafka";
-        homepage = "https://github.com/arnaud-lb/php-rdkafka";
-        maintainers = lib.teams.php.members;
-      };
-    };
 
     redis = buildPecl {
       version = "5.1.1";