wget2 | Floating Point Exception with Unknown-sized File (#674)

[Pairman (@Pairman)]

Pairman created an issue: https://gitlab.com/gnuwget/wget2/-/issues/674



When downloading from a URL a file whose size is unknown, wget2 will fail on 
start and throw "floating point exception":

```
$ wget --verbose 
https://github.com/rockdaboot/wget2/archive/refs/heads/master.zip
                          [htt]
                          [Fil]                      Floating point exception 
(core dumped)
```


The file is downloadable with wget1 or other tools (e.g. chrome or whatever 
browsers).

This error is probably due to unknown file size being divided when calculating 
the progress percentage. Any URL like 
"https://github.com/<owner_name>/<repo_name>/refs/heads/<tag_name>.zip" 
triggers this since all of them have unknown file size at download time.

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