Fix OpenBSD build

Add #include <sys/types.h>, needed by #include <sys/socket.h>.
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>

qemu_socket.h

@@ -17,6 +17,7 @@ int inet_aton(const char *cp, struct in_addr *ia);
 
 #else
 
+#include <sys/types.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <netinet/tcp.h>