added the new upload_bufsize to the connectdata struct

/* Download buffer size, keep it fairly big for speed reasons */

#define BUFSIZE (1024*50)

/* Upload buffer size, keep it smallish to get faster progress meter

   updates. This should probably become dynamic and adjust to the upload

   speed. */

#define UPLOAD_BUFSIZE (1024*2)

/* Initial size of the buffer to store headers in, it'll be enlarged in case

   of need. */

#define HEADERSIZE 256

  long bytecount;

  struct timeval now;

  long upload_bufsize; /* adjust as you see fit, never bigger than BUFSIZE

                          never smaller than UPLOAD_BUFSIZE */

  /* These two functions MUST be set by the curl_connect() function to be

     be protocol dependent */

  CURLcode (*curl_do)(struct connectdata *connect);