Restore change by Huber: [fix] sleep functions must have libc signatures

include/common/xil/sleep.h

@@ -75,8 +75,8 @@ extern "C" {
 	(timeout>0) ? 0 : -1;  \
  }  )
 
-void usleep(unsigned long useconds);
-void sleep(unsigned int seconds);
+int usleep(unsigned long useconds);
+unsigned int sleep(unsigned int seconds);
 int usleep_R5(unsigned long useconds);
 unsigned sleep_R5(unsigned int seconds);
 int usleep_MB(unsigned long useconds);

src/xil_sleepcommon.c

@@ -39,7 +39,7 @@
 * @note             none
 *
 *****************************************************************************/
- void sleep(unsigned int seconds)
+ unsigned int sleep(unsigned int seconds)
  {
 #if defined (ARMR5)
 	sleep_R5(seconds);
@@ -65,7 +65,7 @@
 * @note             none
 *
 *****************************************************************************/
- void usleep(unsigned long useconds)
+ int usleep(unsigned long useconds)
  {
 #if defined (ARMR5)
 	usleep_R5(useconds);