Remove unused variable

Author: edolstra

src/libutil/url.cc

@@ -22,7 +22,6 @@ ParsedURL parseURL(const std::string & url)
     std::smatch match;
 
     if (std::regex_match(url, match, uriRegex)) {
-        auto & base = match[1];
         std::string scheme = match[2];
         auto authority = match[3].matched
             ? std::optional<std::string>(match[3]) : std::nullopt;