Fix systemd compilation & enable systemd on travis

.travis.yml

@@ -33,6 +33,7 @@ matrix:
         - libuv1-dev
         - ninja-build
         - libsodium-dev
+        - libsystemd-dev
   - name: "make release (linux/gcc)"
     os: linux
     compiler: gcc

llarp/router/router.cpp

@@ -694,7 +694,8 @@ namespace llarp
         hiddenServiceContext().ForEachService(
             [&ss](const auto &name, const auto &ep) {
               ss << " [" << name << " " << std::setprecision(4)
-                 << (100.0 * ep->CurrentBuildStats().SuccessRatio) << "%]";
+                 << (100.0 * ep->CurrentBuildStats().SuccessRatio()) << "%]";
+              return true;
             });
       }
       const auto status = ss.str();