5261 libm should stop using synonyms.h

*** 47,57 ****
   *         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);
--- 47,56 ----