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>

@@ -25,11 +25,11 @@
 /*
  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
 
-#pragma weak acosh = __acosh
+#pragma weak __acosh = acosh
 
 /* INDENT OFF */
 /*
  * acosh(x)
  * Method :

@@ -44,11 +44,10 @@
  *      acosh(x) is NaN with signal if x < 1.
  *      acosh(NaN) is NaN without signal.
  */
 /* INDENT ON */
 
-#include "libm_synonyms.h"      /* __acosh, __log, __log1p */
 #include "libm_protos.h"        /* _SVID_libm_error */
 #include "libm_macros.h"
 #include <math.h>
 
 static const double