Update CMakeLists.txt (#482)

* Update CMakeLists.txt

Link systemd libraries, to avoid underlinking of tests with 
-DWITH_SYSTEMD_SOCKET_ACTIVATION=ON

[ 82%] Linking CXX executable gtest_dlt_daemon_gateway
cd dlt-daemon-2.18.9/obj-x86_64-linux-gnu/tests && /usr/bin/cmake -E cmake_link_script CMakeFiles/gtest_dlt_daemon_gateway.dir/link.txt --verbose=1
/usr/bin/c++ -g -O2 -ffile-prefix-map=dlt-daemon-2.18.9=. -flto=auto -ffat-lto-objects -flto=auto -ffat-lto-objects -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -isystem /include -std=gnu++0x -Wl,-Bsymbolic-functions -flto=auto -ffat-lto-objects -flto=auto -Wl,-z,relro -rdynamic CMakeFiles/gtest_dlt_daemon_gateway.dir/gtest_dlt_daemon_gateway.cpp.o CMakeFiles/gtest_dlt_daemon_gateway.dir/__/systemd/3rdparty/sd-daemon.c.o -o gtest_dlt_daemon_gateway  -Wl,-rpath,dlt-daemon-2.18.9/obj-x86_64-linux-gnu/src/daemon ../src/daemon/libdlt_daemon.so /usr/lib/x86_64-linux-gnu/libgtest.a /usr/lib/x86_64-linux-gnu/libgtest_main.a -lrt /usr/lib/x86_64-linux-gnu/libgtest.a 
/usr/bin/ld: ../src/daemon/libdlt_daemon.so: undefined reference to `sd_listen_fds_with_names'

* Add systemd libs for WITH_SYSTEMD as well

and removed deprecated versions

Signed-off-by: Michael Methner <mmethner@de.adit-jv.com>

---------

Signed-off-by: Michael Methner <mmethner@de.adit-jv.com>
Co-authored-by: Michael Methner <mmethner@de.adit-jv.com>

tests/CMakeLists.txt

@@ -21,8 +21,12 @@ else()
     set(LIBRARIES socket)
 endif()
 
+if(WITH_SYSTEMD)
+  set(SYSTEMD_LIBS systemd)
+endif(WITH_SYSTEMD)
+
 set(DLT_LIBRARIES dlt ${GTEST_LIBS} ${LIBRARIES})
-set(DLT_DAEMON_LIBRARIES dlt_daemon ${GTEST_LIBS} ${LIBRARIES})
+set(DLT_DAEMON_LIBRARIES dlt_daemon ${GTEST_LIBS} ${LIBRARIES} ${SYSTEMD_LIBS})
 set(DLT_CONTROL_LIBRARIES dlt dlt_control_common_lib ${GTEST_LIBS})
 
 #Receiver used for QTs. add_test() is not required