Fix ty_stat keeping garbage in ty_file_info.fileindex on Windows
Fix ty_stat keeping garbage in ty_file_info.fileindex on Windows

In Windows 7 and before, the unique file index is 64-bit as opposed
to the 128-bit ID available in later versions.

So we must really clear the first 64 bits instead of keeping whatever
garbage was there.

Koromix/tytools,Koromix/ty,Koromix/ty,Koromix/tytools,Koromix/tytools,Koromix/ty