added support for broadcasting to UDP sockets (patch 1740266)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@47126 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/sckaddr.h

@@ -64,6 +64,7 @@ public:
   virtual bool IsLocalHost() const = 0;
 
   virtual bool AnyAddress() = 0;
+  virtual bool BroadcastAddress() = 0;
 
   virtual wxString IPAddress() const = 0;
 
@@ -93,6 +94,8 @@ public:
 
   // any (0.0.0.0)
   virtual bool AnyAddress();
+  // all (255.255.255.255)
+  virtual bool BroadcastAddress();
 
   virtual wxString Hostname() const;
   wxString OrigHostname() { return m_origHostname; }
@@ -149,6 +152,8 @@ public:
 
   // any (0000:0000:0000:0000:0000:0000:0000:0000 (::))
   virtual bool AnyAddress();
+  // all (?)
+  virtual bool BroadcastAddress();
 
   // 3ffe:ffff:0100:f101:0210:a4ff:fee3:9566
   virtual wxString IPAddress() const;