*: remove some uses of argc

*: remove some uses of argc

function                                             old     new   delta
whoami_main                                           34      37      +3
logname_main                                          60      63      +3
hostid_main                                           35      38      +3
ttysize_main                                         136     135      -1
nmeter_main                                          673     672      -1
logger_main                                          387     386      -1
uuencode_main                                        330     328      -2
ifupdown_main                                       2125    2123      -2
mesg_main                                            158     155      -3
free_main                                            333     330      -3
cal_main                                             902     899      -3
acpid_main                                           443     440      -3
ar_main                                              196     189      -7
find_main                                            476     467      -9
ifconfig_main                                       1235    1221     -14
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/12 up/down: 9/-49)            Total: -40 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>