5261 libm should stop using synonyms.h

*** 25,40 ****
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma weak fex_get_handling = __fex_get_handling
! #pragma weak fex_set_handling = __fex_set_handling
! #pragma weak fex_getexcepthandler = __fex_getexcepthandler
! #pragma weak fex_setexcepthandler = __fex_setexcepthandler
  
- #include "fenv_synonyms.h"
  #include <fenv.h>
  #include <ucontext.h>
  #include <thread.h>
  #include "fex_handler.h"
  
--- 25,39 ----
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma weak __fex_get_handling = fex_get_handling
! #pragma weak __fex_set_handling = fex_set_handling
! #pragma weak __fex_getexcepthandler = fex_getexcepthandler
! #pragma weak __fex_setexcepthandler = fex_setexcepthandler
  
  #include <fenv.h>
  #include <ucontext.h>
  #include <thread.h>
  #include "fex_handler.h"