DRTVWR-440 fix 'unreachable code' warning-as-error when buildin /Od

indra/newview/llweb.cpp

@@ -247,6 +247,5 @@ bool LLWeb::useExternalBrowser(const std::string &url)
 		boost::match_results<std::string::const_iterator> matches;
 		return boost::regex_search(url, matches, pattern);
 	}
-	return false;
 #endif
 }