5261 libm should stop using synonyms.h

@@ -29,11 +29,11 @@
 
 /*
  * long double gammal_r(long double x, int *signgamlp);
  */
 
-#pragma weak gammal_r = __gammal_r
+#pragma weak __gammal_r = gammal_r
 
 #include "libm.h"
 #include "longdouble.h"
 
 long double