linux/hardened/4.19: fix build

pkgs/top-level/linux-kernels.nix

@@ -529,7 +529,10 @@ in {
       stdenv = gcc10Stdenv;
       buildPackages = buildPackages // { stdenv = buildPackages.gcc10Stdenv; };
     });
-    linux_4_19_hardened = recurseIntoAttrs (hardenedPackagesFor kernels.linux_4_19 { });
+    linux_4_19_hardened = recurseIntoAttrs (hardenedPackagesFor kernels.linux_4_19 {
+      stdenv = gcc10Stdenv;
+      buildPackages = buildPackages // { stdenv = buildPackages.gcc10Stdenv; };
+    });
     linux_5_4_hardened = recurseIntoAttrs (hardenedPackagesFor kernels.linux_5_4 { });
     linux_5_10_hardened = recurseIntoAttrs (hardenedPackagesFor kernels.linux_5_10 { });
     linux_5_15_hardened = recurseIntoAttrs (hardenedPackagesFor kernels.linux_5_15 { });