5261 libm should stop using synonyms.h

@@ -56,11 +56,11 @@
  *
  * Accuracy:
  *      computer TRIG(x) returns trig(x) nearly rounded.
  */
 
-#pragma weak tanl = __tanl
+#pragma weak __tanl = tanl
 
 #include "libm.h"
 #include "longdouble.h"
 
 long double