FtpSize - Determine size of remote file.
int FtpSize(char *path, int *size, netbuf *nControl);
path A pointer to a buffer where the result should be returned.
size A pointer to an int where the size will be returned.
A handle returned by FtpConnect().
FtpSize() attempts to determine the size of a remote file.
If a good response is received and the size is successfully parsed out
of the result, 1 is returned. Otherwise, 0 is returned.
Some servers may not support the SIZE command. If this request fails,
the size may be available in the response to a RETR (FtpOpen()with