5261 libm should stop using synonyms.h

*** 25,35 ****
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma weak tgammaf = __tgammaf
  
  /*
   * True gamma function
   *
   * float tgammaf(float x)
--- 25,35 ----
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma weak __tgammaf = tgammaf
  
  /*
   * True gamma function
   *
   * float tgammaf(float x)
*** 38,48 ****
   *
   * Maximum error observed: 0.87ulp (both positive and negative arguments)
   */
  
  #include "libm.h"
- #include "libm_synonyms.h"
  #include <math.h>
  #if defined(__SUNPRO_C)
  #include <sunmath.h>
  #endif
  #include <sys/isa_defs.h>
--- 38,47 ----