Windows: Hardlinks do not need write permission

This fixes execution errors where some programs fail to execute while a
source file is hardlinked into another scheduled actions. Many compilers
restrict the sharing mode for the files they open, 'cl.exe' for instance
does not allow other processes to have open WRITE handles to its source
files, and fails with SHARING_VIOLATION if such handles are open. The
hardlinking file fetcher does not need this permission and we solve many
crashes by removing it.

pkg/filesystem/local_directory_windows.go

@@ -859,7 +859,7 @@ func buildFileLinkInfo(root windows.Handle, name []uint16) ([]byte, uint32) {
 
 func createNTFSHardlink(oldHandle windows.Handle, oldName string, newHandle windows.Handle, newName string) error {
 	var handle windows.Handle
-	err := ntCreateFile(&handle, windows.FILE_GENERIC_READ|windows.FILE_GENERIC_WRITE, oldHandle, oldName, windows.FILE_OPEN, 0)
+	err := ntCreateFile(&handle, windows.FILE_GENERIC_READ, oldHandle, oldName, windows.FILE_OPEN, 0)
 	if err != nil {
 		return err
 	}