Change network transmitted doubles to fio_fp64_t IEEE 754 type

Encode and decode when transferring over the network.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/stat.h b/stat.h
index 72cbe16..89766fc 100644
--- a/stat.h
+++ b/stat.h
@@ -141,7 +141,7 @@
 	 * IO depth and latency stats
 	 */
 	uint64_t clat_percentiles;
-	double *percentile_list;
+	fio_fp64_t percentile_list[FIO_IO_U_LIST_MAX_LEN];
 
 	uint32_t io_u_map[FIO_IO_U_MAP_NR];
 	uint32_t io_u_submit[FIO_IO_U_MAP_NR];