dovecot: disable lua if !withLua

pkgs/by-name/do/dovecot/generic.nix

@@ -168,6 +168,7 @@ stdenv.mkDerivation (finalAttrs: {
     "--with-lucene"
     "--with-icu"
     "--with-textcat"
+    "--with-lua=${lib.boolToYesNo withLua}"
   ]
   ++ lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
     "i_cv_epoll_works=${lib.boolToYesNo stdenv.hostPlatform.isLinux}"
@@ -189,7 +190,6 @@ stdenv.mkDerivation (finalAttrs: {
   ++ lib.optional stdenv.hostPlatform.isDarwin "--enable-static"
   ++ lib.optional withLDAP "--with-ldap"
   ++ lib.optional withPCRE2 "--with-pcre2"
-  ++ lib.optional withLua "--with-lua"
   ++ lib.optional withMySQL "--with-mysql"
   ++ lib.optional withPgSQL "--with-pgsql"
   ++ lib.optional withSQLite "--with-sqlite";