suppress warnings about easch <applet>_main() having

no preceding prototype

procps/free.c

@@ -11,6 +11,7 @@
 
 #include "busybox.h"
 
+int free_main(int argc, char **argv);
 int free_main(int argc, char **argv)
 {
 	struct sysinfo info;

procps/fuser.c

@@ -301,6 +301,7 @@ static int fuser_kill_pid_list(pid_list *plist, int sig)
 	return success;
 }
 
+int fuser_main(int argc, char **argv);
 int fuser_main(int argc, char **argv)
 {
 	int port, i, optn;

procps/kill.c

@@ -10,6 +10,7 @@
 
 #include "busybox.h"
 
+int kill_main(int argc, char **argv);
 int kill_main(int argc, char **argv)
 {
 	char *arg;

procps/pidof.c

@@ -16,6 +16,7 @@ enum {
 	OPT_OMIT   = USE_FEATURE_PIDOF_OMIT(  (1<<OPTBIT_OMIT  )) + 0,
 };
 
+int pidof_main(int argc, char **argv);
 int pidof_main(int argc, char **argv)
 {
 	unsigned first = 1;

procps/ps.c

@@ -233,6 +233,7 @@ static void format_process(const procps_status_t *ps)
 /* Cannot be const: parse_o() will choke */
 static char default_o[] = "pid,user" /* TODO: ,vsz,stat */ ",args";
 
+int ps_main(int argc, char **argv);
 int ps_main(int argc, char **argv)
 {
 	procps_status_t *p;
@@ -280,6 +281,7 @@ int ps_main(int argc, char **argv)
 #else /* !ENABLE_DESKTOP */
 
 
+int ps_main(int argc, char **argv);
 int ps_main(int argc, char **argv)
 {
 	procps_status_t *p = NULL;

procps/renice.c

@@ -26,6 +26,7 @@ void BUG_bad_PRIO_PROCESS(void);
 void BUG_bad_PRIO_PGRP(void);
 void BUG_bad_PRIO_USER(void);
 
+int renice_main(int argc, char **argv);
 int renice_main(int argc, char **argv)
 {
 	static const char Xetpriority_msg[] = "%cetpriority";

procps/sysctl.c

@@ -56,6 +56,7 @@ static void dwrite_str(int fd, const char *buf)
 /*
  *    sysctl_main()...
  */
+int sysctl_main(int argc, char **argv);
 int sysctl_main(int argc, char **argv)
 {
 	int retval = 0;

procps/top.c

@@ -411,6 +411,7 @@ static void sig_catcher(int sig ATTRIBUTE_UNUSED)
 #endif /* FEATURE_USE_TERMIOS */
 
 
+int top_main(int argc, char **argv);
 int top_main(int argc, char **argv)
 {
 	int count, lines, col;

procps/uptime.c

@@ -25,6 +25,7 @@
 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
 
 
+int uptime_main(int argc, char **argv);
 int uptime_main(int argc, char **argv)
 {
 	int updays, uphours, upminutes;