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 exp = __exp
+#pragma weak __exp = exp
 
 /*
  * exp(x)
  * Hybrid algorithm of Peter Tang's Table driven method (for large
  * arguments) and an accurate table (for small arguments).