5261 libm should stop using synonyms.h

@@ -42,11 +42,11 @@
  * Special cases:
  *      if x is NaN, return x itself;
  *      if |x|>1, return NaN with invalid signal.
  */
 
-#pragma weak acosl = __acosl
+#pragma weak __acosl = acosl
 
 #include "libm.h"
 
 static const long double zero = 0.0L, one = 1.0L;