can-utils: cleanup headers

- add missing sys/socket.h: on some systems (like Android)
have SOCK_RAW definition directly in sys/socket.h

- use sys/wait.h instead if wait.h

- include termios.h explicitly (Android)

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

slcand.c

@@ -44,14 +44,15 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
-#include <sys/types.h>
-#include <sys/stat.h>
 #include <fcntl.h>
 #include <syslog.h>
 #include <errno.h>
 #include <pwd.h>
 #include <signal.h>
+#include <sys/socket.h>
 #include <sys/ioctl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
 #include <net/if.h>
 
 /* default slcan line discipline since Kernel 2.6.25 */