make non-static global debugging-only functions static inline (bug 1170).

Compilers shouldn't warn on unused static inline function and just don't emit code for
them in optimized builds.
Also debugging-only functions don't pollute symbol tables.

examples/energy/energy-model-example.cc

@@ -35,7 +35,7 @@ NS_LOG_COMPONENT_DEFINE ("EnergyExample");
 
 using namespace ns3;
 
-std::string
+static inline std::string
 PrintReceivedPacket (Address& from)
 {
   InetSocketAddress iaddr = InetSocketAddress::ConvertFrom (from);

examples/routing/manet-routing-compare.cc

@@ -119,7 +119,7 @@ RoutingExperiment::RoutingExperiment ()
 {
 }
 
-std::string
+static inline std::string
 PrintReceivedPacket (Ptr<Socket> socket, Ptr<Packet> packet)
 {
   SocketAddressTag tag;

examples/wireless/multirate.cc

@@ -309,14 +309,14 @@ Experiment::SendMultiDestinations (Ptr<Node> sender, NodeContainer c)
     }
 }
 
-Vector
+static inline Vector
 GetPosition (Ptr<Node> node)
 {
   Ptr<MobilityModel> mobility = node->GetObject<MobilityModel> ();
   return mobility->GetPosition ();
 }
 
-std::string
+static inline std::string
 PrintPosition (Ptr<Node> client, Ptr<Node> server)
 {
   Vector serverPos = GetPosition (server);

examples/wireless/wifi-simple-interference.cc

@@ -96,7 +96,7 @@ NS_LOG_COMPONENT_DEFINE ("WifiSimpleInterference");
 
 using namespace ns3;
 
-std::string PrintReceivedPacket (Ptr<Socket> socket)
+static inline std::string PrintReceivedPacket (Ptr<Socket> socket)
 {
   Address addr;
   socket->GetSockName (addr);
@@ -108,7 +108,7 @@ std::string PrintReceivedPacket (Ptr<Socket> socket)
   return oss.str ();
 }
 
-void ReceivePacket (Ptr<Socket> socket)
+static void ReceivePacket (Ptr<Socket> socket)
 {
   NS_LOG_UNCOND (PrintReceivedPacket (socket));
 }

src/test/ns3wifi/wifi-interference-test-suite.cc

@@ -77,7 +77,7 @@ WifiInterferenceTestCase::~WifiInterferenceTestCase ()
 {
 }
 
-std::string
+static inline std::string
 PrintReceivedPacket (Ptr<Socket> socket)
 {
   Address addr;

src/topology-read/model/rocketfuel-topology-reader.cc

@@ -77,7 +77,7 @@ int linksNumber = 0;
 int nodesNumber = 0;
 std::map<std::string, Ptr<Node> > nodeMap;
 
-void
+static inline void
 PrintNodeInfo (std::string & uid, std::string & loc, bool dns, bool bb,
                std::vector <std::string>::size_type neighListSize,
                std::string & name, int radius)