Problem: unused include directives

Solution: remove and add where needed

unittests/unittest_ip_resolver.cpp

@@ -25,6 +25,12 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include <ip_resolver.hpp>
 #include <ip.hpp>
 
+#ifndef _WIN32
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netdb.h>
+#endif
+
 void setUp ()
 {
 }