runtime/cgo: do not link math lib by default on windows

Makes windows same as others.

Change-Id: Ib4651e06d0bd37473ac345d36c91f39aa8f5e662
Reviewed-on: https://go-review.googlesource.com/31791Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Minux Ma <minux@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/runtime/cgo/cgo.go

@@ -20,7 +20,7 @@ package cgo
 #cgo !android,linux LDFLAGS: -lpthread
 #cgo netbsd LDFLAGS: -lpthread
 #cgo openbsd LDFLAGS: -lpthread
-#cgo windows LDFLAGS: -lm -mthreads
+#cgo windows LDFLAGS: -mthreads
 
 #cgo CFLAGS: -Wall -Werror