5261 libm should stop using synonyms.h

@@ -90,12 +90,12 @@
  *      Special case:
  *         erf(inf)  = 1
  *         erfc(inf) = 0
  */
 
-#pragma weak erfl = __erfl
-#pragma weak erfcl = __erfcl
+#pragma weak __erfl = erfl
+#pragma weak __erfcl = erfcl
 
 #include "libm.h"
 #include "longdouble.h"
 
 static long double