fix: Show first server start message only when start was successful - #8467

[ 58%] Linking CXX executable ../../../bin/Deskflow.app/Contents/MacOS/deskflow-server
ld: warning: ignoring duplicate libraries: '-lpthread', '../../lib/arch/libarch.a', '../../lib/base/libbase.a', '../../lib/client/libclient.a', '../../lib/deskflow/libapp.a', '../../lib/io/libio.a', '../../lib/mt/libmt.a', '../../lib/net/libnet.a', '../../lib/platform/libplatform.a', '../../lib/server/libserver.a'
[ 59%] Linking CXX executable ../../../bin/Deskflow.app/Contents/MacOS/deskflow-client
ld: library 'pthread' not found
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [bin/Deskflow.app/Contents/MacOS/deskflow-server] Error 1
make[1]: *** [src/apps/deskflow-server/CMakeFiles/deskflow-server.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
ld: warning: ignoring duplicate libraries: '-lpthread', '../../lib/arch/libarch.a', '../../lib/base/libbase.a', '../../lib/client/libclient.a', '../../lib/deskflow/libapp.a', '../../lib/io/libio.a', '../../lib/mt/libmt.a', '../../lib/net/libnet.a', '../../lib/platform/libplatform.a', '../../lib/server/libserver.a'
ld: library 'pthread' not found
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [bin/Deskflow.app/Contents/MacOS/deskflow-client] Error 1
make[1]: *** [src/apps/deskflow-client/CMakeFiles/deskflow-client.dir/all] Error 2
[ 59%] Built target gui_autogen
make: *** [all] Error 2