rabbitmq-c: remove unused inputs, split outputs

* Move to finalAttrs pattern
* Add pkgConfigModules

pkgs/by-name/ra/rabbitmq-c/package.nix

@@ -4,32 +4,37 @@
   fetchFromGitHub,
   cmake,
   openssl,
-  popt,
-  xmlto,
+  testers,
 }:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "rabbitmq-c";
   version = "0.15.0";
 
+  outputs = [
+    "out"
+    "dev"
+  ];
+
   src = fetchFromGitHub {
     owner = "alanxz";
     repo = "rabbitmq-c";
-    rev = "v${version}";
+    rev = "v${finalAttrs.version}";
     hash = "sha256-uOI+YV9aV/LGlSxr75sSii5jQ005smCVe14QAGNpKY8=";
   };
 
   nativeBuildInputs = [ cmake ];
-  buildInputs = [
-    openssl
-    popt
-    xmlto
-  ];
+  buildInputs = [ openssl ];
 
   meta = with lib; {
     description = "RabbitMQ C AMQP client library";
     homepage = "https://github.com/alanxz/rabbitmq-c";
     license = licenses.mit;
     platforms = platforms.unix;
+    pkgConfigModules = [ "librabbitmq" ];
   };
-}
+
+  passthru = {
+    tests.pkg-config = testers.testMetaPkgConfig finalAttrs.finalPackage;
+  };
+})