postfix: build with tlsrpt support

Adds support for TLSRPT (RFC8460) error reporting.

https://www.postfix.org/TLSRPT_README.html

pkgs/by-name/po/postfix/package.nix

@@ -26,6 +26,8 @@
   libmysqlclient,
   withSQLite ? false,
   sqlite,
+  withTLSRPT ? true,
+  libtlsrpt,
 }:
 
 let
@@ -48,6 +50,7 @@ let
       "-DHAS_LDAP"
       "-DUSE_LDAP_SASL"
     ]
+    ++ lib.optional withTLSRPT "-DUSE_TLSRPT"
   );
   auxlibs = lib.concatStringsSep " " (
     [
@@ -62,6 +65,7 @@ let
     ++ lib.optional withMySQL "-lmysqlclient"
     ++ lib.optional withSQLite "-lsqlite3"
     ++ lib.optional withLDAP "-lldap"
+    ++ lib.optional withTLSRPT "-ltlsrpt"
   );
 
 in
@@ -90,7 +94,8 @@ stdenv.mkDerivation rec {
     ++ lib.optional withPgSQL libpq
     ++ lib.optional withMySQL libmysqlclient
     ++ lib.optional withSQLite sqlite
-    ++ lib.optional withLDAP openldap;
+    ++ lib.optional withLDAP openldap
+    ++ lib.optional withTLSRPT libtlsrpt;
 
   hardeningDisable = [ "format" ];
   hardeningEnable = [ "pie" ];