getparam: remove support for --ftpport

It has been deprecated and undocumented since commit ad5ead8bed7 (Dec
2003). --ftp-port is the proper long option name.
diff --git a/src/tool_getparam.c b/src/tool_getparam.c
index ff49c98..c06bdcb 100644
--- a/src/tool_getparam.c
+++ b/src/tool_getparam.c
@@ -259,8 +259,6 @@
   {"O",  "remote-name",              FALSE},
   {"Oa", "remote-name-all",          FALSE},
   {"p",  "proxytunnel",              FALSE},
-  {"P",  "ftpport",                  TRUE},
-         /* 'ftpport' old version */
   {"P",  "ftp-port",                 TRUE},
   {"q",  "disable",                  FALSE},
   {"Q",  "quote",                    TRUE},