Remove fClient

Client (SPV) mode never got implemented entirely, and whatever part was already
working, is likely not been tested (or even executed at all) for the past two
years. This removes it entirely.

If we want an SPV implementation, I think we should first get the block chain
data structures to be encapsulated in a class implementing a standard interface,
and then writing an alternate implementation with SPV semantics.

src/net.cpp

@@ -45,10 +45,9 @@ struct LocalServiceInfo {
 //
 // Global state variables
 //
-bool fClient = false;
 bool fDiscover = true;
 bool fUseUPnP = false;
-uint64 nLocalServices = (fClient ? 0 : NODE_NETWORK);
+uint64 nLocalServices = NODE_NETWORK;
 static CCriticalSection cs_mapLocalHost;
 static map<CNetAddr, LocalServiceInfo> mapLocalHost;
 static bool vfReachable[NET_MAX] = {};