5261 libm should stop using synonyms.h

@@ -47,11 +47,10 @@
  *         Hence lgamma(s) ~ -log(s) for tiny s
  *
  */
 
 #include "libm.h"
-#include "libm_synonyms.h"
 #include "longdouble.h"
 
 static long double neg(long double, int *);
 static long double poly(long double, const long double *, int);
 static long double polytail(long double);