Add support for setting the SO_REUSEADDR option for sockets

src/platform-win32.cc

Index: src/platform-win32.cc
===================================================================
--- src/platform-win32.cc	(revision 1552)
+++ src/platform-win32.cc	(working copy)
@@ -1565,6 +1565,8 @@
   int Send(const char* data, int len) const;
   int Receive(char* data, int len) const;
 
+  bool SetReuseAddress(bool reuse_address);
+
   bool IsValid() const { return socket_ != INVALID_SOCKET; }
 
  private:
@@ -1661,6 +1663,14 @@
 }
 
 
+bool Win32Socket::SetReuseAddress(bool reuse_address) {
+  BOOL on = reuse_address ? TRUE : FALSE;
+  int status = setsockopt(socket_, SOL_SOCKET, SO_REUSEADDR,
+                          reinterpret_cast<char*>(&on), sizeof(on));
+  return status == SOCKET_ERROR;
+}
+
+
 bool Socket::Setup() {
   // Initialize Winsock32
   int err;