Add missing prototypes.

c/src/lib/libbsp/sparc/leon2/cchip/cchip.c

@@ -188,7 +188,7 @@ int init_pcif(void){
 #ifndef GAISLER_FTAHBRAM
  #define GAISLER_FTAHBRAM 0x50
 #endif
-int init_onboard_sram(){
+int init_onboard_sram(void){
 	amba_ahb_device ahb;
 	amba_apb_device apb;
 	unsigned int conf, size;

c/src/lib/libbsp/sparc/leon2/gnatsupp/gnatsupp.c

@@ -14,7 +14,7 @@ void __gnat_install_handler_common (int t1, int t2);
  */
 
 void
-__gnat_install_handler ()
+__gnat_install_handler (void)
 {
   __gnat_install_handler_common (0x18, 0x12);
 }

c/src/lib/libbsp/sparc/leon2/timer/timer.c

@@ -26,7 +26,7 @@ rtems_boolean Timer_driver_Find_average_overhead;
 
 rtems_boolean Timer_driver_Is_initialized = FALSE;
 
-void Timer_initialize()
+void Timer_initialize(void)
 {
   /*
    *  Timer runs long and accurate enough not to require an interrupt.
@@ -53,7 +53,7 @@ void Timer_initialize()
                              /*     to start/stop the timer. */
 #define LEAST_VALID       2  /* Don't trust a value lower than this */
 
-int Read_timer()
+int Read_timer(void)
 {
   uint32_t total;