postgresql.pkgs.pg_auto_failover: fix build on linux

This failed because libpam, which postgresql is now linked against, was missing as a
build input. In general, this is an indication that this extension needs the same
build inputs that postgresql was built with - so we just pass those instead.

This makes similar build failures less likely in the future.

pkgs/servers/sql/postgresql/ext/pg_auto_failover.nix

@@ -11,8 +11,7 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-OIWykfFbVskrkPG/zSmZtZjc+W956KSfIzK7f5QOqpI=";
   };
 
-  buildInputs = [ postgresql openssl zlib readline libkrb5 ]
-    ++ lib.optionals (stdenv.isLinux && lib.versionOlder postgresql.version "13") [ libxcrypt ];
+  buildInputs = postgresql.buildInputs ++ [ postgresql ];
 
   installPhase = ''
     install -D -t $out/bin src/bin/pg_autoctl/pg_autoctl