leveldb: Add snappy dependency (#89852)

This is practically required. Without this option, snappy compression is not supported, so
1) newly created leveldb stores will take more space than needed
2) existing snappy-compressed stores won't be opened by tools built without the snappy support

pkgs/development/libraries/leveldb/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, fixDarwinDylibNames }:
+{ stdenv, fetchFromGitHub, fixDarwinDylibNames, snappy }:
 
 stdenv.mkDerivation rec {
   pname = "leveldb";
@@ -11,6 +11,8 @@ stdenv.mkDerivation rec {
     sha256 = "01kxga1hv4wp94agx5vl3ybxfw5klqrdsrb6p6ywvnjmjxm8322y";
   };
 
+  buildInputs = [ snappy ];
+
   nativeBuildInputs = []
     ++ stdenv.lib.optional stdenv.isDarwin [ fixDarwinDylibNames ];