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>

slcanpty.c

@@ -34,6 +34,7 @@
 #include <termios.h>
 
 #include <net/if.h>
+#include <sys/socket.h>
 #include <sys/ioctl.h>
 #include <sys/stat.h>
 #include <sys/types.h>