5261 libm should stop using synonyms.h

@@ -24,11 +24,11 @@
 /*
  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
 
-#pragma weak exp2 = __exp2
+#pragma weak __exp2 = exp2
 
 /* INDENT OFF */
 /*
  * exp2(x)
  * Code by K.C. Ng for SUN 4.0 libm.