5261 libm should stop using synonyms.h

@@ -24,11 +24,11 @@
 /*
  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
 
-#pragma weak lgamma_r = __lgamma_r
+#pragma weak __lgamma_r = lgamma_r
 
 #include "libm.h"
 
 double
 lgamma_r(double x, int *signgamp) {