refactoring to compile for windows OS

windows os does not like to work with fuse

weed/server/webdav_server.go

@@ -13,7 +13,6 @@ import (
 	"golang.org/x/net/webdav"
 	"google.golang.org/grpc"
 
-	"github.com/chrislusf/seaweedfs/weed/filesys"
 	"github.com/chrislusf/seaweedfs/weed/operation"
 	"github.com/chrislusf/seaweedfs/weed/pb"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
@@ -480,7 +479,7 @@ func (f *WebDavFile) Read(p []byte) (readSize int, err error) {
 	}
 	if f.reader == nil {
 		chunkViews := filer2.ViewFromVisibleIntervals(f.entryViewCache, 0, math.MaxInt32)
-		f.reader = filesys.NewChunkReaderAtFromClient(f.fs, chunkViews, f.fs.chunkCache)
+		f.reader = filer2.NewChunkReaderAtFromClient(f.fs, chunkViews, f.fs.chunkCache)
 	}
 
 	readSize, err = f.reader.ReadAt(p, f.off)