amp-handling bug in bstring_buildurl

[Wichert Akkerman]

I found a bug in the handling of ampersands in bstring_buildurl: if base 
redir_url already has a query string '&' is always inserted instead
of the amp parameter that is passed in. This breaks environments where
wisprlogin or uamserver have a predefined query string.

I have attached a patch which fixes this issue.

Wichert.
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