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/smbd/server.c

@@ -203,7 +203,7 @@ max can be %d\n",
 		memcpy((char *)&lfds, (char *)&listen_set, 
 		       sizeof(listen_set));
 		
-		num = sys_select(FD_SETSIZE,&lfds,NULL);
+		num = sys_select_intr(FD_SETSIZE,&lfds,NULL);
 		
 		if (num == -1 && errno == EINTR)
 			continue;