Linux kernel oplocks now seem to work, but need a _lot_ of testing

I had to modify sys_select() to not loop on EINTR. I added a wrapper
called sys_select_intr() which gives the old behaviour.

source/libsmb/nmblib.c

@@ -967,7 +967,7 @@ struct packet_struct *receive_packet(int fd,enum packet_type type,int t)
 	timeout.tv_sec = t/1000;
 	timeout.tv_usec = 1000*(t%1000);
 
-	if ((ret = sys_select(fd+1,&fds,&timeout)) == -1) {
+	if ((ret = sys_select_intr(fd+1,&fds,&timeout)) == -1) {
 		/* errno should be EBADF or EINVAL. */
 		DEBUG(0,("select returned -1, errno = %s (%d)\n", strerror(errno), errno));
 		return NULL;