*: 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
 
diff --git a/include/libbb.h b/include/libbb.h
index df8b0ec..c6c2be2 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -237,7 +237,8 @@
 	int (*dirAction) (const char *fileName, struct stat* statbuf, void* userData, int depth),
 	void* userData, unsigned depth);
 extern int device_open(const char *device, int mode);
-extern int getpty(char *line, int size);
+enum { GETPTY_BUFSIZE = 16 }; /* more than enough for "/dev/ttyXXX" */
+extern int getpty(char *line);
 extern int get_console_fd(void);
 extern char *find_block_device(const char *path);
 /* bb_copyfd_XX print read/write errors and return -1 if they occur */
diff --git a/include/usage.h b/include/usage.h
index f94fa2f..507a52d 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -989,6 +989,7 @@
        ""
 #define false_full_usage \
        "Return an exit code of FALSE (1)"
+
 #define false_example_usage \
        "$ false\n" \
        "$ echo $?\n" \