fuse-7z-ng: link to <https://github.com/kedazo/fuse-7z-ng/pull/8>

The patch file added in the last commit was based on this linked PR
(authored by me).

pkgs/tools/filesystems/fuse-7z-ng/default.nix

@@ -16,6 +16,7 @@ stdenv.mkDerivation rec {
     ./no-pthread.patch
     # Zero-initialize unset fields of `struct fuse_operations` so that
     # garbage values don't cause segfault.
+    # <https://github.com/kedazo/fuse-7z-ng/pull/8>
     ./zero-init-fuse-operations.patch
   ];
 

pkgs/tools/filesystems/fuse-7z-ng/zero-init-fuse-operations.patch

@@ -1,4 +1,5 @@
 Zero-initialize unset fields of `struct fuse_operations`.
+<https://github.com/kedazo/fuse-7z-ng/pull/8>
 --- a/src/main.cpp
 +++ b/src/main.cpp
 @@ -195,7 +195,7 @@ main (int argc, char **argv)