struct timex is defined by sys/timex.h -> bits/timex.h.
Glibc includes the header in time.h, but let's explicitly include it
when the struct is used.
Similar to
4f18ff2e29b8054f30b084abcabf5f689f4b340b, but for sys/timex.h.
#include <string.h>
#include <sys/resource.h>
#include <sys/socket.h>
+#include <sys/timex.h>
#define __STDC_WANT_IEC_60559_TYPES_EXT__
#include <float.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <resolv.h>
+#include <sys/timex.h>
#include <unistd.h>
#include "sd-bus.h"