remove unused includes

This patch removes includes that are not used. The removals were found with
include-what-you-use which checks if any of the symbols from a header is
in use.

src/hostname/hostnamectl.c

@@ -21,12 +21,9 @@
 
 #include <stdlib.h>
 #include <stdbool.h>
-#include <unistd.h>
 #include <getopt.h>
 #include <locale.h>
 #include <string.h>
-#include <sys/timex.h>
-#include <sys/utsname.h>
 
 #include "sd-bus.h"
 
@@ -35,12 +32,8 @@
 #include "util.h"
 #include "spawn-polkit-agent.h"
 #include "build.h"
-#include "clock-util.h"
-#include "strv.h"
 #include "sd-id128.h"
-#include "virt.h"
 #include "architecture.h"
-#include "fileio.h"
 
 static bool arg_ask_password = true;
 static BusTransport arg_transport = BUS_TRANSPORT_LOCAL;

src/hostname/hostnamed.c

@@ -30,7 +30,6 @@
 #include "virt.h"
 #include "env-util.h"
 #include "fileio-label.h"
-#include "label.h"
 #include "bus-util.h"
 #include "event-util.h"
 #include "selinux-util.h"