5261 libm should stop using synonyms.h

@@ -24,11 +24,11 @@
 /*
  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
 
-#pragma weak tanf = __tanf
+#pragma weak __tanf = tanf
 
 #include "libm.h"
 
 extern const int _TBL_ipio2_inf[];
 extern int __rem_pio2m(double *, double *, int, int, int, const int *);