remove sys_socket include from netdb tests

tests/netdb/getaddrinfo.c

@@ -5,7 +5,6 @@
 #include <stdlib.h>
 #include <netdb.h>
 #include <sys/types.h>
-#include <sys/socket.h>
 #include <arpa/inet.h>
 
 #include "test_helpers.h"

tests/netdb/getaddrinfo_null.c

@@ -3,7 +3,6 @@
 #include <string.h>
 #include <stdbool.h>
 #include <sys/types.h>
-#include <sys/socket.h>
 #include <netdb.h>
 #include <arpa/inet.h>