4823 don't open-code NSEC2MSEC and MSEC2NSEC

*** 1,12 ****
  /*
   * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
- #pragma ident   "%Z%%M% %I%     %E% SMI"
- 
  /*
   * The contents of this file are subject to the Netscape Public
   * License Version 1.1 (the "License"); you may not use this file
   * except in compliance with the License. You may obtain a copy of
   * the License at http://www.mozilla.org/NPL/
--- 1,10 ----
*** 315,325 ****
                          tval.tv_sec = msec / MILLISEC;
                          tval.tv_usec = (MICROSEC / MILLISEC) *
                                              (msec % MILLISEC);
  #ifdef _SOLARIS_SDK
                          start_time = gethrtime();
!                         tv_time = (hrtime_t)msec * (NANOSEC / MILLISEC);
  #else
                          start_time = (long)time(NULL);
  #endif
                  } else {
                          tval.tv_sec = 0;
--- 313,323 ----
                          tval.tv_sec = msec / MILLISEC;
                          tval.tv_usec = (MICROSEC / MILLISEC) *
                                              (msec % MILLISEC);
  #ifdef _SOLARIS_SDK
                          start_time = gethrtime();
!                         tv_time = MSEC2NSEC(msec);
  #else
                          start_time = (long)time(NULL);
  #endif
                  } else {
                          tval.tv_sec = 0;