fix build - missed this file

TBR=r
OCL=23335
CL=23335

src/lib/math/runtime.go

+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package math
+
+// implemented in C, in ../../runtime
+// perhaps one day the implementations will move here.
+
+func Float32bits(f float32) (b uint32) 
+func Float32frombits(b uint32) (f float32) 
+func Float64bits(f float64) (b uint64) 
+func Float64frombits(b uint64) (f float64) 
+func Frexp(f float64) (frac float64, exp int) 
+func Inf(sign int32) (f float64) 
+func IsInf(f float64, sign int) (is bool) 
+func IsNaN(f float64) (is bool) 
+func Ldexp(frac float64, exp int) (f float64) 
+func Modf(f float64) (integer float64, frac float64) 
+func NaN() (f float64)