gpgstats: fix build on 32-bit; LFS problems

pkgs/tools/security/gpgstats/default.nix

···
     cp gpgstats $out/bin
   '';
 
+  NIX_CFLAGS_COMPILE = stdenv.lib.optionals (!stdenv.is64bit)
+    [ "-D_FILE_OFFSET_BITS=64" "-DLARGEFILE_SOURCE=1" ];
+
   meta = with stdenv.lib; {
     description = "Calculates statistics on the keys in your gpg key-ring";
     longDescription = ''