Build failed on mac os( filemdl_darwin.go had windows sys calls)

filemdl/filemdl_darwin.go

+// TODO: Build flag needs to be passed while building exe/executable
+// +build !windows
+
 package filemdl
 
 import (
 	"os"
-	"syscall"
-	"unsafe"
-)
-
-const (
-	moveFileReplacExisting = 0x1
-	moveFileWriteThrough   = 0x8
-)
-
-var (
-	modkernel32     = syscall.NewLazyDLL("kernel32.dll")
-	procMoveFileExW = modkernel32.NewProc("MoveFileExW")
 )
 
-//sys moveFileEx(lpExistingFileName *uint16, lpNewFileName *uint16, dwFlags uint32) (err error) = MoveFileExW
-
 // AtomicReplaceFile atomically replaces the destination file or directory with the
 // source.  It is guaranteed to either replace the target file entirely, or not
 // change either file.
 func AtomicReplaceFile(source, destination string) error {
-	src, err := syscall.UTF16PtrFromString(source)
-	if err != nil {
-		return &os.LinkError{"replace", source, destination, err}
-	}
-	dest, err := syscall.UTF16PtrFromString(destination)
-	if err != nil {
-		return &os.LinkError{"replace", source, destination, err}
-	}
-
-	// see http://msdn.microsoft.com/en-us/library/windows/desktop/aa365240(v=vs.85).aspx
-	if err := moveFileEx(src, dest, moveFileReplacExisting|moveFileWriteThrough); err != nil {
-		return &os.LinkError{"replace", source, destination, err}
-	}
-	return nil
-}
-
-func moveFileEx(lpExistingFileName *uint16, lpNewFileName *uint16, dwFlags uint32) (err error) {
-	r1, _, e1 := syscall.Syscall(procMoveFileExW.Addr(), 3, uintptr(unsafe.Pointer(lpExistingFileName)), uintptr(unsafe.Pointer(lpNewFileName)), uintptr(dwFlags))
-	if r1 == 0 {
-		if e1 != 0 {
-			err = error(e1)
-		} else {
-			err = syscall.EINVAL
-		}
-	}
-	return
+	return os.Rename(source, destination)
 }