cmUdpNet.h: Added extern "C" {} wrapper.

cmUdpNet.h

 #ifndef cmUdpNet_h
 #define cmUdpNet_h
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /*
   A cmUdpNet is a wrapper around a single cmUdpPort. This object
   maintains an array of remote nodes which map application defined
 
 // Return the node label associated with a node id or NULL if the id 
 // is not found.
-const cmChar_t*   cmUdpNetNodeIdToLabel( cmUdpNetH_t h, unsigned id );
+const cmChar_t* cmUdpNetNodeIdToLabel( cmUdpNetH_t h, unsigned id );
 
 // Get the total count of nodes on the network.  This count includes the local node.
 unsigned        cmUdpNetNodeCount( cmUdpNetH_t h );
 
 cmRC_t cmUdpNetTest( cmCtx_t* ctx, int argc, char* argv[] );
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif