Fix *(reinterpret_cast<unsigned int*>(&block)) = idx; dereferencing type-punned pointer will break strict-aliasing rules

[pbelevich]

       *(reinterpret_cast<unsigned int*>(&block)) = idx;
  ^    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
pytorch/csprng/torchcsprng/csrc/csprng.h:74:2: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]

[gmuraru]

Can the issues be taken by anyone? :)

[pbelevich]

@gmuraru of course! We appreciate all contributions!

[pbelevich]

Unfortunately I had to fix it to unblock the users