Drop duplicated function tool_millisleep() and use dbus_sleep_milliseconds() instead.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=89284
Reviewed-by: Simon McVittie <simon.mcvittie@collabora.co.uk>

tools/dbus-echo.c

@@ -89,7 +89,7 @@ filter (DBusConnection *connection,
 
   if (sleep_ms > 0)
     {
-      tool_millisleep (sleep_ms);
+      _dbus_sleep_milliseconds (sleep_ms);
     }
 
   if (!noreply)

tools/tool-common.c

@@ -37,25 +37,6 @@
 #include <unistd.h>
 #endif
 
-/* a hack to avoid having to depend on the static -util version of libdbus;
- * it's useful for ancillary programs to be able to use the shared library */
-void
-tool_millisleep (unsigned int ms)
-{
-#ifdef DBUS_WIN
-  Sleep (ms);
-#else
-  fd_set nothing;
-  struct timeval tv;
-
-  tv.tv_sec = ms / 1000;
-  tv.tv_usec = (ms % 1000) * 1000;
-
-  FD_ZERO (&nothing);
-  select (1, &nothing, &nothing, &nothing, &tv);
-#endif
-}
-
 void
 tool_oom (const char *doing)
 {

tools/tool-common.h

@@ -32,7 +32,6 @@
 #define VERBOSE(...) do {} while (0)
 #endif
 
-void tool_millisleep (unsigned int ms);
 void tool_oom (const char *doing) _DBUS_GNUC_NORETURN;
 dbus_bool_t tool_write_all (int fd, const void *buf, size_t size);