Strip trailing slash

[jangregor]

If the URL ends in / the UDPXY-like processing does not work. A solution would be to strip trailing / like this:

        if (url[strlen(url)-1] == '/') {
                logger(LOG_DEBUG, "Stripping trailing /: %s\n", url);
                url[strlen(url)-1] = '\0';
        }

A good place would be to put this in src/httpclients.c right above:
urlfrom = rindex(url, '/');