9971 Make getrandom(2) a public interface

*** 8,24 ****
   * source.  A copy of the CDDL is also available via the Internet at
   * http://www.illumos.org/license/CDDL.
   */
  
  /*
!  * Copyright (c) 2015 Joyent, Inc.
   */
  
  #include <sys/types.h>
  #include <sys/syscall.h>
  #include <sys/random.h>
  
! int
! getrandom(void *buf, size_t len, int flags)
  {
          return (syscall(SYS_getrandom, buf, len, flags));
  }
--- 8,24 ----
   * source.  A copy of the CDDL is also available via the Internet at
   * http://www.illumos.org/license/CDDL.
   */
  
  /*
!  * Copyright (c) 2018 Joyent, Inc.
   */
  
  #include <sys/types.h>
  #include <sys/syscall.h>
  #include <sys/random.h>
  
! ssize_t
! getrandom(void *buf, size_t len, unsigned int flags)
  {
          return (syscall(SYS_getrandom, buf, len, flags));
  }