[Backport release-26.05] frr: fix cross build with lua scripting (#537136)

pkgs/by-name/fr/frr/package.nix

@@ -46,6 +46,7 @@
   cumulusSupport ? false,
   irdpSupport ? true,
   mgmtdSupport ? true,
+  scriptingSupport ? true,
   # Experimental as of 10.1, reconsider if upstream changes defaults
   grpcSupport ? false,
 
@@ -120,7 +121,6 @@ stdenv.mkDerivation (finalAttrs: {
     python3
     readline
     rtrlib
-    lua53Packages.lua
     sqlite
   ]
   ++ lib.optionals stdenv.hostPlatform.isLinux [
@@ -135,11 +135,17 @@ stdenv.mkDerivation (finalAttrs: {
   ++ lib.optionals grpcSupport [
     grpc
     protobuf
+  ]
+  ++ lib.optionals scriptingSupport [
+    lua53Packages.lua
   ];
 
   # otherwise in cross-compilation: "configure: error: no working python version found"
   depsBuildBuild = [
     buildPackages.python3
+  ]
+  ++ lib.optionals scriptingSupport [
+    buildPackages.lua53Packages.lua
   ];
 
   # cross-compiling: clippy is compiled with the build host toolchain, split it out to ease
@@ -157,7 +163,6 @@ stdenv.mkDerivation (finalAttrs: {
     "--enable-logfile-mask=0640"
     "--enable-multipath=${toString numMultipath}"
     "--enable-config-rollbacks"
-    "--enable-scripting"
     "--enable-user=frr"
     "--enable-vty-group=frrvty"
     "--localstatedir=/var"
@@ -171,6 +176,7 @@ stdenv.mkDerivation (finalAttrs: {
     (lib.strings.enableFeature irdpSupport "irdp")
     (lib.strings.enableFeature mgmtdSupport "mgmtd")
     (lib.strings.enableFeature grpcSupport "grpc")
+    (lib.strings.enableFeature scriptingSupport "scripting")
 
     # routing protocols
     (lib.strings.enableFeature bgpdSupport "bgpd")