Remove writeConnFailedFromScratch()

It is static and only used from a single place, so let's inline it.

common/rfb/SConnection.cxx

   throw ConnFailedException(str);
 }
 
-void SConnection::writeConnFailedFromScratch(const char* msg,
-                                             rdr::OutStream* os)
-{
-  os->writeBytes("RFB 003.003\n", 12);
-  os->writeU32(0);
-  os->writeString(msg);
-  os->flush();
-}
-
 void SConnection::setAccessRights(AccessRights ar)
 {
   accessRights = ar;

common/rfb/SConnection.h

     // ConnFailedException.
     void throwConnFailedException(const char* format, ...) __printf_attr(2, 3);
 
-    // writeConnFailedFromScratch() sends a conn failed message to an OutStream
-    // without the need to negotiate the protocol version first.  It actually
-    // does this by assuming that the client will understand version 3.3 of the
-    // protocol.
-    static void writeConnFailedFromScratch(const char* msg,
-                                           rdr::OutStream* os);
-
     SMsgReader* reader() { return reader_; }
     SMsgWriter* writer() { return writer_; }
 

common/rfb/VNCServerST.cxx

   if (blHosts->isBlackmarked(address.buf)) {
     connectionsLog.error("blacklisted: %s", address.buf);
     try {
-      SConnection::writeConnFailedFromScratch("Too many security failures",
-                                              &sock->outStream());
+      rdr::OutStream& os = sock->outStream();
+
+      // Shortest possible way to tell a client it is not welcome
+      os.writeBytes("RFB 003.003\n", 12);
+      os.writeU32(0);
+      os.writeString("Too many security failures");
+      os.flush();
     } catch (rdr::Exception&) {
     }
     sock->shutdown();