*: fix fallout from -Wunused-parameter

function                                             old     new   delta
bbunpack                                             358     366      +8
passwd_main                                         1070    1072      +2
handle_incoming_and_exit                            2651    2653      +2
getpty                                                88      86      -2
script_main                                          975     972      -3
inetd_main                                          2036    2033      -3
dname_enc                                            377     373      -4
make_new_session                                     474     462     -12
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/5 up/down: 12/-24)            Total: -12 bytes
   text    data     bss     dec     hex filename
 797429     658    7428  805515   c4a8b busybox_old
 797417     658    7428  805503   c4a7f busybox_unstripped

diff --git a/include/busybox.h b/include/busybox.h
index 5272024..cad45ac 100644
--- a/include/busybox.h
+++ b/include/busybox.h
@@ -64,9 +64,9 @@
 	) MAIN_EXTERNALLY_VISIBLE;
 #if ENABLE_BUILD_LIBBUSYBOX
 #if ENABLE_FEATURE_SHARED_BUSYBOX
-int lbb_main(int argc, char **argv) EXTERNALLY_VISIBLE;
+int lbb_main(char **argv) EXTERNALLY_VISIBLE;
 #else
-int lbb_main(int argc, char **argv);
+int lbb_main(char **argv);
 #endif
 #endif