Enable to compile and run on ARM platforms

This change enables fabric code to be compiled and executed on ARM
platforms such as for example Raspberry Pi devices.

Change-Id: I98cb8fd2fdb32b478b4e62a46ca6b3d822432b1b
Signed-off-by: Artem Barger <[email protected]>

Author: C0rWin

gossip/state/payloads_buffer.go

@@ -54,10 +54,10 @@ type PayloadsBuffer interface {
 // PayloadsBufferImpl structure to implement PayloadsBuffer interface
 // store inner state of available payloads and sequence numbers
 type PayloadsBufferImpl struct {
-	buf map[uint64]*proto.Payload
-
 	next uint64
 
+	buf map[uint64]*proto.Payload
+
 	readyChan chan struct{}
 
 	mutex sync.RWMutex