5261 libm should stop using synonyms.h

*** 24,34 ****
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma weak remainder = __remainder
  
  /*
   * remainder(x,p)
   * Code originated from 4.3bsd.
   * Modified by K.C. Ng for SUN 4.0 libm.
--- 24,34 ----
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma weak __remainder = remainder
  
  /*
   * remainder(x,p)
   * Code originated from 4.3bsd.
   * Modified by K.C. Ng for SUN 4.0 libm.