5261 libm should stop using synonyms.h

@@ -25,11 +25,11 @@
 /*
  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
 
-#pragma weak lgammal = __lgammal
+#pragma weak __lgammal = lgammal
 
 /*
  * long double lgammal(long double x);
  */