Curl_ftpsendf's third argument is now a const char *

lib/ftp.h

@@ -28,7 +28,7 @@ CURLcode Curl_ftp_done(struct connectdata *conn);
 CURLcode Curl_ftp_connect(struct connectdata *conn);
 CURLcode Curl_ftp_disconnect(struct connectdata *conn);
 
-size_t Curl_ftpsendf(int fd, struct connectdata *, char *fmt, ...);
+size_t Curl_ftpsendf(int fd, struct connectdata *, const char *fmt, ...);
 
 /* The kerberos stuff needs this: */
 int Curl_GetFTPResponse(int sockfd, char *buf,