5261 libm should stop using synonyms.h

@@ -28,11 +28,10 @@
 
         .file "tan.s"
 
 #include "libm.h"
 LIBM_ANSI_PRAGMA_WEAK(tan,function)
-#include "libm_synonyms.h"
 #include "libm_protos.h"
 
         ENTRY(tan)
         PIC_SETUP(1)
         call    PIC_F(__reduction)