5261 libm should stop using synonyms.h

@@ -28,11 +28,10 @@
 
         .file "exp2.s"
 
 #include "libm.h"
 LIBM_ANSI_PRAGMA_WEAK(exp2,function)
-#include "libm_synonyms.h"
 
         ENTRY(exp2)
         movl    8(%esp),%ecx            / ecx <-- hi_32(x)
         andl    $0x7fffffff,%ecx        / ecx <-- hi_32(|x|)
         cmpl    $0x3ff00000,%ecx        / Is |x| < 1?