server: make struct group_run_stats network transfer friendly

Use explicitly sized types.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/fio.h b/fio.h
index db0a417..5928b45 100644
--- a/fio.h
+++ b/fio.h
@@ -46,11 +46,11 @@
 #endif
 
 struct group_run_stats {
-	unsigned long long max_run[2], min_run[2];
-	unsigned long long max_bw[2], min_bw[2];
-	unsigned long long io_kb[2];
-	unsigned long long agg[2];
-	unsigned int kb_base;
+	uint64_t max_run[2], min_run[2];
+	uint64_t max_bw[2], min_bw[2];
+	uint64_t io_kb[2];
+	uint64_t agg[2];
+	uint32_t kb_base;
 };
 
 /*