base64: new applet

base64: new applet

function                                             old     new   delta
base64_main                                            -     217    +217
packed_usage                                       27181   27229     +48
read_base64                                          348     373     +25
applet_names                                        2299    2306      +7
bbconfig_config_bz2                                 4942    4948      +6
applet_main                                         1352    1356      +4
applet_nameofs                                       676     678      +2
applet_install_loc                                   169     170      +1
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 7/0 up/down: 310/0)             Total: 310 bytes

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>