libgloss/riscv: Fix old style function declaration warnings

Signed-off-by: Pincheng Wang <[email protected]>

Author: wpcwzy

libgloss/libnosys/sbrk.c

@@ -4,8 +4,7 @@
 #include <_syslist.h>
 
 void *
-_sbrk (incr)
-     int incr;
+_sbrk (int incr)
 {
    extern char   end; /* Set by linker.  */
    static char * heap_end;

libgloss/riscv/semihost-sys_sbrk.c

@@ -12,8 +12,7 @@ char *heap_ptr;
  *         left of memory on the board.
  */
 char *
-_sbrk (nbytes)
-     int nbytes;
+_sbrk (int nbytes)
 {
   char *base;
 

libgloss/riscv/sys_sbrk.c

@@ -10,8 +10,7 @@ char *heap_ptr;
  *         left of memory on the board.
  */
 char *
-_sbrk (nbytes)
-     int nbytes;
+_sbrk (int nbytes)
 {
   char        *base;