fix some compiler warnings.

lib/syslib/sys_fork.c

@@ -13,7 +13,7 @@ struct mem_map *map_ptr;
 
   m.PR_ENDPT = parent;
   m.PR_SLOT = child;
-  m.PR_MEM_PTR = map_ptr;
+  m.PR_MEM_PTR = (char *) map_ptr;
   r = _taskcall(SYSTASK, SYS_FORK, &m);
   *child_endpoint = m.PR_ENDPT;
   return r;

lib/syslib/sys_vsafecopy.c

@@ -9,7 +9,7 @@ PUBLIC int sys_vsafecopy(struct vscp_vec *vec, int els)
 
   message copy_mess;
 
-  copy_mess.VSCP_VEC_ADDR = vec;
+  copy_mess.VSCP_VEC_ADDR = (char *) vec;
   copy_mess.VSCP_VEC_SIZE = els;
 
   return(_taskcall(SYSTASK, SYS_VSAFECOPY, &copy_mess));