basic: include only what we use

This is a cleaned up result of running iwyu but without forward
declarations on src/basic.

src/basic/socket-label.c

@@ -20,9 +20,13 @@
 ***/
 
 #include <errno.h>
+#include <netinet/in.h>
+#include <stdbool.h>
 #include <stddef.h>
 #include <string.h>
+#include <sys/socket.h>
 #include <sys/stat.h>
+#include <sys/un.h>
 #include <unistd.h>
 
 #include "alloc-util.h"
@@ -32,7 +36,7 @@
 #include "mkdir.h"
 #include "selinux-util.h"
 #include "socket-util.h"
-#include "util.h"
+#include "log.h"
 
 int socket_address_listen(
                 const SocketAddress *a,