UUID4-Tiny: add potential patch for aarch64

Hopefully ofborg can confirm or deny this works...

pkgs/top-level/perl-packages.nix

@@ -24497,6 +24497,12 @@ let
       url = "mirror://cpan/authors/id/C/CV/CVLIBRARY/UUID4-Tiny-0.002.tar.gz";
       sha256 = "e7535b31e386d432dec7adde214348389e1d5cf753e7ed07f1ae04c4360840cf";
     };
+    postPatch = lib.optionalString (stdenv.isAarch64) ''
+      # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/uapi/asm-generic/unistd.h
+      # printf SYS_getrandom | gcc -include sys/syscall.h -E -
+      substituteInPlace lib/UUID4/Tiny.pm \
+        --replace "syscall( 318" "syscall( 278"
+    '';
     meta = {
       description = "Cryptographically secure v4 UUIDs for Linux x64";
       license = with lib.licenses; [ artistic1 gpl1Plus ];