[build2] bpkg: curl fails without retry

[Boris Kolpackov]

Feiyun Wang <feiyunw at yahoo.com> writes:

> But I didn't find wget.exe in the provided build2-baseutils or
> build2-mingw packages. I suggest to have wget(>=1.16) included,
> and may it fix this problem without any other modification?

We used to ship wget in baseutils but it had some issues (as pretty
much every MSYS2 utility, but the details escape my memory).