Refactoring louloulibs and cmake

Use OBJECT libraries
Remove the louloulibs directory
Write FOUND variables in the cache

src/network/dns_socket_handler.cpp

@@ -0,0 +1,43 @@
+#include <biboumi.h>
+#ifdef UDNS_FOUND
+
+#include <network/dns_socket_handler.hpp>
+#include <network/dns_handler.hpp>
+#include <network/poller.hpp>
+
+#include <udns.h>
+
+DNSSocketHandler::DNSSocketHandler(std::shared_ptr<Poller>& poller,
+                                   const socket_t socket):
+  SocketHandler(poller, socket)
+{
+  poller->add_socket_handler(this);
+}
+
+DNSSocketHandler::~DNSSocketHandler()
+{
+  this->unwatch();
+}
+
+void DNSSocketHandler::on_recv()
+{
+  dns_ioevent(nullptr, 0);
+}
+
+bool DNSSocketHandler::is_connected() const
+{
+  return true;
+}
+
+void DNSSocketHandler::unwatch()
+{
+  if (this->poller->is_managing_socket(this->socket))
+    this->poller->remove_socket_handler(this->socket);
+}
+
+void DNSSocketHandler::watch()
+{
+  this->poller->add_socket_handler(this);
+}
+
+#endif /* UDNS_FOUND */