Merge pull request #12911 from tg-x/grsec-url

grsecurity: use source URL from a scraped repository

pkgs/os-specific/linux/kernel/patches.nix

···
     { name = "grsecurity-${grversion}-${kversion}";
       inherit grversion kversion revision;
       patch = fetchurl {
-        url = "http://grsecurity.net/${branch}/grsecurity-${grversion}-${kversion}-${revision}.patch";
+        url = "https://github.com/slashbeast/grsecurity-scrape/blob/master/${branch}/grsecurity-${grversion}-${kversion}-${revision}.patch?raw=true";
         inherit sha256;
       };
       features.grsecurity = true;