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 tgammal = __tgammal
+#pragma weak __tgammal = tgammal
 
 #include "libm.h"
 #include <sys/isa_defs.h>
 
 #if defined(_BIG_ENDIAN)