5261 libm should stop using synonyms.h

@@ -33,12 +33,12 @@
  *
  * NOTE: aintl(x), anintl(x), ceill(x), floorl(x), and rintl(x) return result
  * with the same sign as x's,  including 0.0.
  */
 
-#pragma weak ceill = __ceill
-#pragma weak floorl = __floorl
+#pragma weak __ceill = ceill
+#pragma weak __floorl = floorl
 
 #include "libm.h"
 #include "longdouble.h"
 
 static const long double qone = 1.0L;