Merge #10471: Denote functions CNode::GetRecvVersion() and CNode::GetRefCount() as const

5f672ca8c net: Denote some CNode functions const (Pavlos Antoniou)

Tree-SHA512: f6d13d8002a4145fd87b34b35a739284e4a9b1af834bba109d324eccddb684eccb817553ba76102eb5b5819cab37f938b4ba74fdbda7c5386d00747b3024cd81

src/net.h

@@ -711,7 +711,7 @@ public:
         return nMyStartingHeight;
     }
 
-    int GetRefCount()
+    int GetRefCount() const
     {
         assert(nRefCount >= 0);
         return nRefCount;
@@ -723,7 +723,7 @@ public:
     {
         nRecvVersion = nVersionIn;
     }
-    int GetRecvVersion()
+    int GetRecvVersion() const
     {
         return nRecvVersion;
     }