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5261 libm should stop using synonyms.h
5298 fabs is 0-sized, confuses dis(1) and others
Reviewed by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
Approved by: Gordon Ross <gwr@nexenta.com>

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          --- old/usr/src/lib/libm/common/Q/sinpil.c
          +++ new/usr/src/lib/libm/common/Q/sinpil.c
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  20   20   */
  21   21  
  22   22  /*
  23   23   * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
  24   24   */
  25   25  /*
  26   26   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  27   27   * Use is subject to license terms.
  28   28   */
  29   29  
  30      -#pragma weak sinpil = __sinpil
  31      -
  32   30  /*
  33   31   * long double sinpil(long double x),
  34   32   * return long double precision sinl(pi*x).
  35   33   *
  36   34   * Algorithm, 10/17/2002, K.C. Ng
  37   35   * ------------------------------
  38   36   * Let y = |4x|, z = floor(y), and n = (int)(z mod 8.0) (displayed in binary).
  39   37   *      1. If y == z, then x is a multiple of pi/4. Return the following values:
  40   38   *             ---------------------------------------------------
  41   39   *               n  x mod 2    sin(x*pi)    cos(x*pi)   tan(x*pi)
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